diff --git a/cognite/client/data_classes/capabilities.py b/cognite/client/data_classes/capabilities.py
index 02c075127f..9a15d17dc0 100644
--- a/cognite/client/data_classes/capabilities.py
+++ b/cognite/client/data_classes/capabilities.py
@@ -867,3 +867,8 @@ class Scope:
 _CAPABILITY_CLASS_BY_NAME: dict[str, type[Capability]] = {
     c._capability_name: c for c in Capability.__subclasses__() if not issubclass(c, UnknownAcl)
 }
+# Give all Actions a better error message (instead of implementing __missing__ for all):
+for acl in _CAPABILITY_CLASS_BY_NAME.values():
+    if acl.Action.__members__:
+        _cls = type(next(iter(acl.Action.__members__.values())))
+        _cls.__name__ = f"{acl.__name__} {_cls.__name__}"
diff --git a/tests/tests_unit/test_data_classes/test_capabilities.py b/tests/tests_unit/test_data_classes/test_capabilities.py
index 4bf67ec89c..a9bea08fcc 100644
--- a/tests/tests_unit/test_data_classes/test_capabilities.py
+++ b/tests/tests_unit/test_data_classes/test_capabilities.py
@@ -183,3 +183,28 @@ def test_load_dump_unknown(self, raw: dict[str, Any]) -> None:
         assert all(action is UnknownAcl.Action.Unknown for action in capability.actions)
         assert capability.raw_data == raw
         assert capability.dump(camel_case=True) == raw
+
+    @pytest.mark.parametrize(
+        "acl_cls_name, bad_action, dumped",
+        [
+            ("AssetsAcl", "SONG-WRITER", {"assetsAcl": {"actions": ["READ", "SONG-WRITER"], "scope": {"all": {}}}}),
+            (
+                "DocumentFeedbackAcl",
+                "CTRL-ALT-DELETE",
+                {"documentFeedbackAcl": {"actions": ["CREATE", "CTRL-ALT-DELETE"], "scope": {"all": {}}}},
+            ),
+            (
+                "FilesAcl",
+                "COMPRESS",
+                {"filesAcl": {"actions": ["COMPRESS"], "scope": {"datasetScope": {"ids": ["2332579", "372"]}}}},
+            ),
+            (
+                "NotificationsAcl",
+                "SEND-PIGEON",
+                {"notificationsAcl": {"actions": ["READ", "SEND-PIGEON"], "scope": {"all": {}}}},
+            ),
+        ],
+    )
+    def test_load__action_does_not_exist(self, acl_cls_name: str, bad_action: str, dumped: dict[str, Any]) -> None:
+        with pytest.raises(ValueError, match=rf"^'{bad_action}' is not a valid {acl_cls_name} Action$"):
+            Capability.load(dumped)