username

Author: jiasli

src/azure-cli-core/azure/cli/core/_profile.py

@@ -223,6 +223,9 @@ def login(self,
     def login_with_managed_identity(self, identity_id=None, client_id=None, object_id=None, resource_id=None,
                                     allow_no_subscriptions=None):
         if _use_msal_managed_identity(self.cli_ctx):
+            if identity_id:
+                raise CLIError('--username is not supported by MSAL managed identity. '
+                               'Use --client-id, --object-id or --resource-id instead.')
             return self.login_with_managed_identity_msal(
                 client_id=client_id, object_id=object_id, resource_id=resource_id,
                 allow_no_subscriptions=allow_no_subscriptions)