.

src/Runner.Listener/MessageListener.cs

@@ -528,7 +528,8 @@ private bool IsSessionCreationExceptionRetriable(Exception ex)
             }
             else if (ex is TaskAgentPoolNotFoundException ||
                      ex is AccessDeniedException ||
-                     ex is VssUnauthorizedException)
+                     ex is VssUnauthorizedException ||
+                     (ex is VssOAuthTokenRequestException oauthEx && oauthEx.Error != "server_error"))
             {
                 Trace.Info($"Non-retriable exception: {ex.Message}");
                 return false;