Port auth error handling from microsoft_app_credentials to certificate_app_credentials (#2196)

Co-authored-by: Konstantin Plis <konstantin.plis@acronis.com>

Author: kostyaplis

libraries/botframework-connector/botframework/connector/auth/certificate_app_credentials.py

@@ -67,7 +67,17 @@ def get_access_token(self, force_refresh: bool = False) -> str:
  if not auth_token:
  # No suitable token exists in cache. Let's get a new one from AAD.
  auth_token = self.__get_msal_app().acquire_token_for_client(scopes=scopes)
- return auth_token["access_token"]
+ if "access_token" in auth_token:
+ return auth_token["access_token"]
+ error = auth_token["error"] if "error" in auth_token else "Unknown error"
+ error_description = (
+ auth_token["error_description"]
+ if "error_description" in auth_token
+ else "Unknown error description"
+ )
+ raise PermissionError(
+ f"Failed to get access token with error: {error}, error_description: {error_description}"
+ )
 
  def __get_msal_app(self):
  if not self.app: