diff --git a/docs/libraries/azure-resource-manager/reference/interfaces.md b/docs/libraries/azure-resource-manager/reference/interfaces.md
index 611374846..c5a53c998 100644
--- a/docs/libraries/azure-resource-manager/reference/interfaces.md
+++ b/docs/libraries/azure-resource-manager/reference/interfaces.md
@@ -672,7 +672,7 @@ op Azure.ResourceManager.ArmListBySubscription(apiVersion: string, subscriptionI
 ### `ArmProviderActionAsync` {#Azure.ResourceManager.ArmProviderActionAsync}
 
 ```typespec
-op Azure.ResourceManager.ArmProviderActionAsync(apiVersion: string, subscriptionId: Azure.Core.uuid, location: string, resourceGroupName: string, resourceUri: string, provider: "Microsoft.ThisWillBeReplaced", body: Request): Response | Azure.ResourceManager.CommonTypes.ErrorResponse
+op Azure.ResourceManager.ArmProviderActionAsync(apiVersion: string, subscriptionId: Azure.Core.uuid, location: string, resourceGroupName: string, resourceUri: string, provider: "Microsoft.ThisWillBeReplaced", body: Request): Azure.ResourceManager.ArmAcceptedLroResponse<Description, LroHeaders> | Response | Azure.ResourceManager.CommonTypes.ErrorResponse
 ```
 
 #### Template Parameters
diff --git a/packages/samples/specs/resource-manager/operations/operation-provider/main.tsp b/packages/samples/specs/resource-manager/operations/operation-provider/main.tsp
index 1e8c49a9c..acb6484e3 100644
--- a/packages/samples/specs/resource-manager/operations/operation-provider/main.tsp
+++ b/packages/samples/specs/resource-manager/operations/operation-provider/main.tsp
@@ -48,19 +48,13 @@ model LogAnalyticsCollection is Page<LogAnalyticsOperationResult>;
 interface ProviderOperations {
   /** Operation to get virtual machines for subscription (/subscriptions/{subscriptionId}/providers/Microsoft.ContosoProviderHub/getVmSizes) */
   @get
-  getVmSizes is ArmProviderActionAsync<
-    Response = VmSizeCollection,
-    Scope = SubscriptionActionScope
-  >;
+  getVmSizes is ArmProviderActionSync<Response = VmSizeCollection, Scope = SubscriptionActionScope>;
   /** Operation to get virtual machines for tenant (/providers/Microsoft.ContosoProviderHub/getVmSizesTenant) */
   @get
-  getVmSizesTenant is ArmProviderActionAsync<
-    Response = VmSizeCollection,
-    Scope = TenantActionScope
-  >;
+  getVmSizesTenant is ArmProviderActionSync<Response = VmSizeCollection, Scope = TenantActionScope>;
   /** Operation to get virtual machines for subscription for specific location (/subscriptions/{subscriptionId}/providers/Microsoft.ContosoProviderHub/locations/{location}/getVmSizesLocation) */
   @get
-  getVmSizesLocation is ArmProviderActionAsync<
+  getVmSizesLocation is ArmProviderActionSync<
     Response = VmSizeCollection,
     Scope = SubscriptionActionScope,
     Parameters = LocationParameter
@@ -68,15 +62,36 @@ interface ProviderOperations {
   /** Operation to get throttled requests sharing action (/subscriptions/{subscriptionId}/providers/Microsoft.ContosoProviderHub/logAnalytics/apiAccess/getThrottledRequests) */
   @get
   @action("logAnalytics/apiAccess/getThrottledRequests")
-  getThrottledRequestsSubscription is ArmProviderActionAsync<
+  getThrottledRequestsSubscription is ArmProviderActionSync<
     Response = LogAnalyticsCollection,
     Scope = SubscriptionActionScope
   >;
   /** Operation to get throttled requests sharing action for tenant (/providers/Microsoft.ContosoProviderHub/logAnalytics/apiAccess/getThrottledRequests) */
   @get
   @action("logAnalytics/apiAccess/getThrottledRequests")
-  getThrottledRequestsTenant is ArmProviderActionAsync<
+  getThrottledRequestsTenant is ArmProviderActionSync<
     Response = LogAnalyticsCollection,
     Scope = TenantActionScope
   >;
+  /** Operation to post virtual machines for subscription (/subscriptions/{subscriptionId}/providers/Microsoft.ContosoProviderHub/postVmSizes) */
+  postVmSizes is ArmProviderActionAsync<
+    Response = LogAnalyticsCollection,
+    Scope = SubscriptionActionScope
+  >;
+  /** Operation to post virtual machines for subscription for specific location (/subscriptions/{subscriptionId}/providers/Microsoft.ContosoProviderHub/locations/{location}/postVmSizesLocation) */
+  postVmSizesLocation is ArmProviderActionAsync<
+    Response = LogAnalyticsCollection,
+    Scope = SubscriptionActionScope,
+    Parameters = LocationParameter
+  >;
+  /** Operation to post virtual machines for subscription with retry after header (/subscriptions/{subscriptionId}/providers/Microsoft.ContosoProviderHub/postVmSizesRetry) */
+  postVmSizesRetry is ArmProviderActionAsync<
+    Response = Azure.Core.Foundations.RetryAfterHeader,
+    Scope = SubscriptionActionScope
+  >;
+  /** Operation to post virtual machines for subscription with ARM combined header (/subscriptions/{subscriptionId}/providers/Microsoft.ContosoProviderHub/postVmSizesArmCombined) */
+  postVmSizesArmCombined is ArmProviderActionAsync<
+    Response = ArmCombinedLroHeaders,
+    Scope = SubscriptionActionScope
+  >;
 }
diff --git a/packages/samples/test/output/azure/resource-manager/operations/operation-provider/@azure-tools/typespec-autorest/2022-11-01-preview/openapi.json b/packages/samples/test/output/azure/resource-manager/operations/operation-provider/@azure-tools/typespec-autorest/2022-11-01-preview/openapi.json
index 53a68f634..94f6986fc 100644
--- a/packages/samples/test/output/azure/resource-manager/operations/operation-provider/@azure-tools/typespec-autorest/2022-11-01-preview/openapi.json
+++ b/packages/samples/test/output/azure/resource-manager/operations/operation-provider/@azure-tools/typespec-autorest/2022-11-01-preview/openapi.json
@@ -210,6 +210,61 @@
         }
       }
     },
+    "/subscriptions/{subscriptionId}/providers/Microsoft.OperationStatusSample/locations/{location}/postVmSizesLocation": {
+      "post": {
+        "operationId": "ProviderOperations_PostVmSizesLocation",
+        "tags": [
+          "ProviderOperations"
+        ],
+        "description": "Operation to post virtual machines for subscription for specific location (/subscriptions/{subscriptionId}/providers/Microsoft.ContosoProviderHub/locations/{location}/postVmSizesLocation)",
+        "parameters": [
+          {
+            "$ref": "../../../../../../../../../specs/resource-manager/common-types/v5/types.json#/parameters/ApiVersionParameter"
+          },
+          {
+            "$ref": "../../../../../../../../../specs/resource-manager/common-types/v5/types.json#/parameters/SubscriptionIdParameter"
+          },
+          {
+            "$ref": "../../../../../../../../../specs/resource-manager/common-types/v5/types.json#/parameters/LocationParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "The request has succeeded.",
+            "schema": {
+              "$ref": "#/definitions/LogAnalyticsCollection"
+            }
+          },
+          "202": {
+            "description": "Resource operation accepted.",
+            "headers": {
+              "Location": {
+                "type": "string",
+                "description": "The Location header contains the URL where the status of the long running operation can be checked."
+              },
+              "Retry-After": {
+                "type": "integer",
+                "format": "int32",
+                "description": "The Retry-After header can indicate how long the client should wait before polling the operation status."
+              }
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "../../../../../../../../../specs/resource-manager/common-types/v5/types.json#/definitions/ErrorResponse"
+            }
+          }
+        },
+        "x-ms-long-running-operation-options": {
+          "final-state-via": "location"
+        },
+        "x-ms-long-running-operation": true,
+        "x-ms-pageable": {
+          "nextLinkName": "nextLink"
+        }
+      }
+    },
     "/subscriptions/{subscriptionId}/providers/Microsoft.OperationStatusSample/logAnalytics/apiAccess/getThrottledRequests": {
       "get": {
         "operationId": "ProviderOperations_GetThrottledRequestsSubscription",
@@ -243,9 +298,179 @@
           "nextLinkName": "nextLink"
         }
       }
+    },
+    "/subscriptions/{subscriptionId}/providers/Microsoft.OperationStatusSample/postVmSizes": {
+      "post": {
+        "operationId": "ProviderOperations_PostVmSizes",
+        "tags": [
+          "ProviderOperations"
+        ],
+        "description": "Operation to post virtual machines for subscription (/subscriptions/{subscriptionId}/providers/Microsoft.ContosoProviderHub/postVmSizes)",
+        "parameters": [
+          {
+            "$ref": "../../../../../../../../../specs/resource-manager/common-types/v5/types.json#/parameters/ApiVersionParameter"
+          },
+          {
+            "$ref": "../../../../../../../../../specs/resource-manager/common-types/v5/types.json#/parameters/SubscriptionIdParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "The request has succeeded.",
+            "schema": {
+              "$ref": "#/definitions/LogAnalyticsCollection"
+            }
+          },
+          "202": {
+            "description": "Resource operation accepted.",
+            "headers": {
+              "Location": {
+                "type": "string",
+                "description": "The Location header contains the URL where the status of the long running operation can be checked."
+              },
+              "Retry-After": {
+                "type": "integer",
+                "format": "int32",
+                "description": "The Retry-After header can indicate how long the client should wait before polling the operation status."
+              }
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "../../../../../../../../../specs/resource-manager/common-types/v5/types.json#/definitions/ErrorResponse"
+            }
+          }
+        },
+        "x-ms-long-running-operation-options": {
+          "final-state-via": "location"
+        },
+        "x-ms-long-running-operation": true,
+        "x-ms-pageable": {
+          "nextLinkName": "nextLink"
+        }
+      }
+    },
+    "/subscriptions/{subscriptionId}/providers/Microsoft.OperationStatusSample/postVmSizesArmCombined": {
+      "post": {
+        "operationId": "ProviderOperations_PostVmSizesArmCombined",
+        "tags": [
+          "ProviderOperations"
+        ],
+        "description": "Operation to post virtual machines for subscription with ARM combined header (/subscriptions/{subscriptionId}/providers/Microsoft.ContosoProviderHub/postVmSizesArmCombined)",
+        "parameters": [
+          {
+            "$ref": "../../../../../../../../../specs/resource-manager/common-types/v5/types.json#/parameters/ApiVersionParameter"
+          },
+          {
+            "$ref": "../../../../../../../../../specs/resource-manager/common-types/v5/types.json#/parameters/SubscriptionIdParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "The request has succeeded.",
+            "headers": {
+              "Azure-AsyncOperation": {
+                "type": "string",
+                "format": "uri",
+                "description": "A link to the status monitor"
+              },
+              "Location": {
+                "type": "string",
+                "description": "The Location header contains the URL where the status of the long running operation can be checked."
+              }
+            }
+          },
+          "202": {
+            "description": "Resource operation accepted.",
+            "headers": {
+              "Location": {
+                "type": "string",
+                "description": "The Location header contains the URL where the status of the long running operation can be checked."
+              },
+              "Retry-After": {
+                "type": "integer",
+                "format": "int32",
+                "description": "The Retry-After header can indicate how long the client should wait before polling the operation status."
+              }
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "../../../../../../../../../specs/resource-manager/common-types/v5/types.json#/definitions/ErrorResponse"
+            }
+          }
+        },
+        "x-ms-long-running-operation-options": {
+          "final-state-via": "location"
+        },
+        "x-ms-long-running-operation": true
+      }
+    },
+    "/subscriptions/{subscriptionId}/providers/Microsoft.OperationStatusSample/postVmSizesRetry": {
+      "post": {
+        "operationId": "ProviderOperations_PostVmSizesRetry",
+        "tags": [
+          "ProviderOperations"
+        ],
+        "description": "Operation to post virtual machines for subscription with retry after header (/subscriptions/{subscriptionId}/providers/Microsoft.ContosoProviderHub/postVmSizesRetry)",
+        "parameters": [
+          {
+            "$ref": "../../../../../../../../../specs/resource-manager/common-types/v5/types.json#/parameters/ApiVersionParameter"
+          },
+          {
+            "$ref": "../../../../../../../../../specs/resource-manager/common-types/v5/types.json#/parameters/SubscriptionIdParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "The request has succeeded.",
+            "headers": {
+              "Retry-After": {
+                "type": "integer",
+                "format": "int32",
+                "description": "The Retry-After header can indicate how long the client should wait before polling the operation status."
+              }
+            }
+          },
+          "202": {
+            "description": "Resource operation accepted.",
+            "headers": {
+              "Location": {
+                "type": "string",
+                "description": "The Location header contains the URL where the status of the long running operation can be checked."
+              },
+              "Retry-After": {
+                "type": "integer",
+                "format": "int32",
+                "description": "The Retry-After header can indicate how long the client should wait before polling the operation status."
+              }
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "../../../../../../../../../specs/resource-manager/common-types/v5/types.json#/definitions/ErrorResponse"
+            }
+          }
+        },
+        "x-ms-long-running-operation-options": {
+          "final-state-via": "location"
+        },
+        "x-ms-long-running-operation": true
+      }
     }
   },
   "definitions": {
+    "Azure.Core.Foundations.RetryAfterHeader": {
+      "type": "object",
+      "description": "The retry-after envelope."
+    },
+    "Azure.ResourceManager.ArmCombinedLroHeaders<Azure.ResourceManager.ArmOperationStatus<never, Azure.ResourceManager.ResourceProvisioningState>, void, TypeSpec.Rest.ResourceLocation, string>": {
+      "type": "object",
+      "description": "Provide Both Azure-AsyncOperation and Location headers"
+    },
     "LogAnalyticsCollection": {
       "type": "object",
       "description": "LogAnalytics collection of operation status response",
diff --git a/packages/typespec-azure-resource-manager/CHANGELOG.md b/packages/typespec-azure-resource-manager/CHANGELOG.md
index 9d8d24890..6b53dec9a 100644
--- a/packages/typespec-azure-resource-manager/CHANGELOG.md
+++ b/packages/typespec-azure-resource-manager/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Change Log - @azure-tools/typespec-azure-resource-manager
 
+## 0.47.1
+
+### Bug Fixes
+
+- [#1673](https://github.com/Azure/typespec-azure/pull/1673) Fix `ArmProviderActionAsync` to correctly return 202 responses.
+
+
 ## 0.47.0
 
 ### Bug Fixes
diff --git a/packages/typespec-azure-resource-manager/lib/operations.tsp b/packages/typespec-azure-resource-manager/lib/operations.tsp
index 9deaa0bb0..53ddba5a1 100644
--- a/packages/typespec-azure-resource-manager/lib/operations.tsp
+++ b/packages/typespec-azure-resource-manager/lib/operations.tsp
@@ -752,4 +752,4 @@ op ArmProviderActionAsync<
 
   /** The request body */
   @bodyRoot body: Request,
-): Response | ErrorResponse;
+): ArmAcceptedLroResponse<"Resource operation accepted.", LroHeaders> | Response | ErrorResponse;
diff --git a/packages/typespec-azure-resource-manager/package.json b/packages/typespec-azure-resource-manager/package.json
index 516c866aa..6ebf391f8 100644
--- a/packages/typespec-azure-resource-manager/package.json
+++ b/packages/typespec-azure-resource-manager/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@azure-tools/typespec-azure-resource-manager",
-  "version": "0.47.0",
+  "version": "0.47.1",
   "author": "Microsoft Corporation",
   "description": "TypeSpec Azure Resource Manager library",
   "homepage": "https://azure.github.io/typespec-azure",
diff --git a/packages/typespec-client-generator-core/CHANGELOG.md b/packages/typespec-client-generator-core/CHANGELOG.md
index 5b9c1ebea..e220928f9 100644
--- a/packages/typespec-client-generator-core/CHANGELOG.md
+++ b/packages/typespec-client-generator-core/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Change Log - @azure-tools/typespec-client-generator-core
 
+## 0.47.2
+
+### Bug Fixes
+
+- [#1606](https://github.com/Azure/typespec-azure/pull/1606) overwrite original value when set multiple value for same decorator
+
+
 ## 0.47.1
 
 ### Bug Fixes
diff --git a/packages/typespec-client-generator-core/package.json b/packages/typespec-client-generator-core/package.json
index 34c85b083..b52b05b01 100644
--- a/packages/typespec-client-generator-core/package.json
+++ b/packages/typespec-client-generator-core/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@azure-tools/typespec-client-generator-core",
-  "version": "0.47.1",
+  "version": "0.47.2",
   "author": "Microsoft Corporation",
   "description": "TypeSpec Data Plane Generation library",
   "homepage": "https://azure.github.io/typespec-azure",
diff --git a/packages/typespec-client-generator-core/src/decorators.ts b/packages/typespec-client-generator-core/src/decorators.ts
index d1e8be528..12e1e7ad4 100644
--- a/packages/typespec-client-generator-core/src/decorators.ts
+++ b/packages/typespec-client-generator-core/src/decorators.ts
@@ -28,7 +28,6 @@ import {
   isTemplateDeclarationOrInstance,
   listServices,
   projectProgram,
-  validateDecoratorUniqueOnNode,
 } from "@typespec/compiler";
 import { buildVersionProjections, getVersions } from "@typespec/versioning";
 import {
@@ -108,36 +107,27 @@ function setScopedDecoratorData(
   target: Type,
   value: unknown,
   scope?: LanguageScopes,
-  transitivity: boolean = false,
-): boolean {
+) {
+  // if no scope specified, then set with the new value
+  if (!scope) {
+    context.program.stateMap(key).set(target, Object.fromEntries([[AllScopes, value]]));
+    return;
+  }
+
+  // if scope specified, create or overwrite with the new value
+  const splitScopes = scope.split(",").map((s) => s.trim());
   const targetEntry = context.program.stateMap(key).get(target);
-  const splitScopes = scope?.split(",").map((s) => s.trim()) || [AllScopes];
 
-  // If target doesn't exist in decorator map, create a new entry
+  // if target doesn't exist in decorator map, create a new entry
   if (!targetEntry) {
     const newObject = Object.fromEntries(splitScopes.map((scope) => [scope, value]));
     context.program.stateMap(key).set(target, newObject);
-    return true;
+    return;
   }
 
-  // If target exists, but there's a specified scope and it doesn't exist in the target entry, add mapping of scope and value to target entry
-  const scopes = Reflect.ownKeys(targetEntry);
-  if (!scopes.includes(AllScopes) && scope && !splitScopes.some((s) => scopes.includes(s))) {
-    const newObject = Object.fromEntries(splitScopes.map((scope) => [scope, value]));
-    context.program.stateMap(key).set(target, { ...targetEntry, ...newObject });
-    return true;
-  }
-  // we only want to allow multiple decorators if they each specify a different scope
-  if (!transitivity) {
-    validateDecoratorUniqueOnNode(context, target, decorator);
-    return false;
-  }
-  // for transitivity situation, we could allow scope extension
-  if (!scopes.includes(AllScopes) && !scope) {
-    const newObject = Object.fromEntries(splitScopes.map((scope) => [scope, value]));
-    context.program.stateMap(key).set(target, { ...targetEntry, ...newObject });
-  }
-  return false;
+  // if target exists, overwrite existed value
+  const newObject = Object.fromEntries(splitScopes.map((scope) => [scope, value]));
+  context.program.stateMap(key).set(target, { ...targetEntry, ...newObject });
 }
 
 const clientKey = createStateSymbol("client");
diff --git a/packages/typespec-client-generator-core/src/lib.ts b/packages/typespec-client-generator-core/src/lib.ts
index 60fcac220..828dcfa04 100644
--- a/packages/typespec-client-generator-core/src/lib.ts
+++ b/packages/typespec-client-generator-core/src/lib.ts
@@ -210,6 +210,12 @@ export const $lib = createTypeSpecLibrary({
         default: `@usage override conflicts with the usage calculated from operation or other @usage override.`,
       },
     },
+    "duplicate-decorator": {
+      severity: "warning",
+      messages: {
+        default: paramMessage`Decorator ${"decoratorName"} cannot be used twice on the same declaration with same scope.`,
+      },
+    },
   },
 });
 
diff --git a/packages/typespec-client-generator-core/test/decorators.test.ts b/packages/typespec-client-generator-core/test/decorators.test.ts
index 666145f0b..511d1cab8 100644
--- a/packages/typespec-client-generator-core/test/decorators.test.ts
+++ b/packages/typespec-client-generator-core/test/decorators.test.ts
@@ -272,52 +272,111 @@ describe("typespec-client-generator-core: decorators", () => {
       strictEqual(getAccess(runnerWithJava.context, funcJava), "internal");
     });
 
-    it("duplicate-decorator diagnostic for first non-scoped decorator then scoped decorator", async () => {
-      const diagnostics = await runner.diagnose(`
-      @test
-      @access(Access.internal)
-      @access(Access.internal, "csharp")
-      op func(
-        @query("createdAt")
-        createdAt: utcDateTime;
-      ): void;
-      `);
+    it("first non-scoped decorator then scoped decorator", async () => {
+      const code = `
+        @test
+        @access(Access.public, "csharp")
+        @access(Access.internal)
+        op func(
+          @query("createdAt")
+          createdAt: utcDateTime;
+        ): void;
+      `;
 
-      expectDiagnostics(diagnostics, {
-        code: "duplicate-decorator",
+      const { func } = (await runner.compile(code)) as { func: Operation };
+      strictEqual(getAccess(runner.context, func), "internal");
+
+      const runnerWithCsharp = await createSdkTestRunner({
+        emitterName: "@azure-tools/typespec-csharp",
       });
+      const { func: funcCsharp } = (await runnerWithCsharp.compile(code)) as { func: Operation };
+      strictEqual(getAccess(runnerWithCsharp.context, funcCsharp), "public");
     });
 
-    it("duplicate-decorator diagnostic for first scoped decorator then non-scoped decorator", async () => {
-      const diagnostics = await runner.diagnose(`
-      @test
-      @access(Access.internal, "csharp")
-      @access(Access.internal)
-      op func(
-        @query("createdAt")
-        createdAt: utcDateTime;
-      ): void;
-      `);
+    it("first scoped decorator then non-scoped decorator", async () => {
+      const code = `
+        @test
+        @access(Access.internal)
+        @access(Access.public, "csharp")
+        op func(
+          @query("createdAt")
+          createdAt: utcDateTime;
+        ): void;
+      `;
 
-      expectDiagnostics(diagnostics, {
-        code: "duplicate-decorator",
+      const { func } = (await runner.compile(code)) as { func: Operation };
+      strictEqual(getAccess(runner.context, func), "internal");
+
+      const runnerWithCsharp = await createSdkTestRunner({
+        emitterName: "@azure-tools/typespec-csharp",
       });
+      const { func: funcCsharp } = (await runnerWithCsharp.compile(code)) as { func: Operation };
+      strictEqual(getAccess(runnerWithCsharp.context, funcCsharp), "internal");
     });
 
-    it("duplicate-decorator diagnostic for multiple same scope", async () => {
-      const diagnostics = await runner.diagnose(`
-      @test
-      @access(Access.internal, "csharp")
-      @access(Access.internal, "csharp")
-      op func(
-        @query("createdAt")
-        createdAt: utcDateTime;
-      ): void;
-      `);
+    it("first non-scoped augmented decorator then scoped augmented decorator", async () => {
+      const code = `
+        @test
+        op func(
+          @query("createdAt")
+          createdAt: utcDateTime;
+        ): void;
 
-      expectDiagnostics(diagnostics, {
-        code: "duplicate-decorator",
+        @@access(func, Access.public);
+        @@access(func, Access.internal, "csharp"); 
+      `;
+
+      const { func } = (await runner.compile(code)) as { func: Operation };
+      strictEqual(getAccess(runner.context, func), "public");
+
+      const runnerWithCsharp = await createSdkTestRunner({
+        emitterName: "@azure-tools/typespec-csharp",
+      });
+      const { func: funcCsharp } = (await runnerWithCsharp.compile(code)) as { func: Operation };
+      strictEqual(getAccess(runnerWithCsharp.context, funcCsharp), "internal");
+    });
+
+    it("first scoped augmented decorator then non-scoped augmented decorator", async () => {
+      const code = `
+        @test
+        op func(
+          @query("createdAt")
+          createdAt: utcDateTime;
+        ): void;
+
+        @@access(func, Access.internal, "csharp");
+        @@access(func, Access.public);
+      `;
+
+      const { func } = (await runner.compile(code)) as { func: Operation };
+      strictEqual(getAccess(runner.context, func), "public");
+
+      const runnerWithCsharp = await createSdkTestRunner({
+        emitterName: "@azure-tools/typespec-csharp",
+      });
+      const { func: funcCsharp } = (await runnerWithCsharp.compile(code)) as { func: Operation };
+      strictEqual(getAccess(runnerWithCsharp.context, funcCsharp), "public");
+    });
+
+    it("two scoped decorator", async () => {
+      const code = `
+        @test
+        @access(Access.internal, "csharp")
+        @access(Access.internal, "python")
+        op func(
+          @query("createdAt")
+          createdAt: utcDateTime;
+        ): void;
+      `;
+
+      const { func } = (await runner.compile(code)) as { func: Operation };
+      strictEqual(getAccess(runner.context, func), "internal");
+
+      const runnerWithCsharp = await createSdkTestRunner({
+        emitterName: "@azure-tools/typespec-csharp",
       });
+      const { func: funcCsharp } = (await runnerWithCsharp.compile(code)) as { func: Operation };
+      strictEqual(getAccess(runnerWithCsharp.context, funcCsharp), "internal");
     });
 
     it("csv scope list", async () => {
@@ -379,22 +438,6 @@ describe("typespec-client-generator-core: decorators", () => {
       const { Test: TestJava } = (await javaRunner.compile(testCode)) as { Test: Model };
       strictEqual(getAccess(javaRunner.context, TestJava), "public");
     });
-
-    it("duplicate-decorator diagnostic for csv scope list", async () => {
-      const diagnostics = await runner.diagnose(`
-      @test
-      @access(Access.internal, "csharp,ts")
-      @access(Access.internal, "csharp")
-      op func(
-        @query("createdAt")
-        createdAt: utcDateTime;
-      ): void;
-      `);
-
-      expectDiagnostics(diagnostics, {
-        code: "duplicate-decorator",
-      });
-    });
   });
 
   describe("@flattenProperty", () => {