fix(appconfiguration): handle 403 Forbidden to avoid JSONDecodeError (#46446)

* fix: raise HttpResponseError on 403 to prevent JSONDecodeError on empty body

* pass exception

* Update changelog

---------

Co-authored-by: cwanjau <cwanjau@microsoft.com>

Author: ChristineWanjau

sdk/appconfiguration/azure-appconfiguration/CHANGELOG.md

@@ -8,6 +8,8 @@
 
 ### Bugs Fixed
 
+- Fixed an issue where authorization failures caused crashes. Now an `HttpResponseError` is returned when the required data plane role is missing.
+
 ### Other Changes
 
 ## 1.8.0 (2026-01-26)

sdk/appconfiguration/azure-appconfiguration/azure/appconfiguration/_generated/_operations/_patch.py

@@ -104,6 +104,7 @@ def get_key_values_in_one_page(
 
         error_map: MutableMapping[int, Type[HttpResponseError]] = {
             401: ClientAuthenticationError,
+            403: HttpResponseError,
             404: ResourceNotFoundError,
             409: ResourceExistsError,
             304: ResourceNotModifiedError,
@@ -195,7 +196,11 @@ def prepare_request(next_link=None):
 
         if response.status_code not in valid_status_codes:
             map_error(status_code=response.status_code, response=response, error_map=error_map)
-            error = _deserialize(_models.Error, response.json())
+            error = None
+            try:
+                error = _deserialize(_models.Error, response.json())
+            except (ValueError, KeyError):
+                pass
             raise HttpResponseError(response=response, model=error)
 
         response_headers = response.headers