fix: check for missing hass_url during auto reauth

Reauth attempts may not have a hass url configured. Now, it will try to
generate it or request it from the user.

closes #1702

custom_components/alexa_media/config_flow.py

@@ -244,7 +244,17 @@ async def async_step_user(self, user_input=None):
                 errors={"base": "2fa_key_invalid"},
                 description_placeholders={"message": ""},
             )
-        hass_url: str = user_input.get(CONF_HASS_URL)
+        try:
+            hass_url: str = user_input.get(
+                CONF_HASS_URL, get_url(self.hass, prefer_external=True)
+            )
+        except NoURLAvailableError:
+            _LOGGER.debug("No Home Assistant URL found in config or detected; forcing user form")
+            return self.async_show_form(
+                step_id="user",
+                data_schema=vol.Schema(self.proxy_schema),
+                description_placeholders={"message": ""},
+            )
         hass_url_valid: bool = False
         hass_url_error: str = ""
         async with ClientSession() as session:
@@ -268,9 +278,9 @@ async def async_step_user(self, user_input=None):
                 description_placeholders={
                     "email": self.login.email,
                     "hass_url": hass_url,
-                    "error": hass_url_error
+                    "error": hass_url_error,
                 },
-            )        
+            )
         if (
             user_input
             and user_input.get(CONF_OTPSECRET)
@@ -301,7 +311,8 @@ async def async_step_start_proxy(self, user_input=None):
         if not self.proxy:
             try:
                 self.proxy = AlexaProxy(
-                    self.login, str(URL(self.config.get(CONF_HASS_URL)).with_path(AUTH_PROXY_PATH))
+                    self.login,
+                    str(URL(self.config.get(CONF_HASS_URL)).with_path(AUTH_PROXY_PATH)),
                 )
             except ValueError as ex:
                 return self.async_show_form(
@@ -558,7 +569,7 @@ async def _test_login(self):
                 "access_token": login.access_token,
                 "refresh_token": login.refresh_token,
                 "expires_in": login.expires_in,
-                "mac_dms": login.mac_dms
+                "mac_dms": login.mac_dms,
             }
             self.hass.data.setdefault(
                 DATA_ALEXAMEDIA,