Authentication Failed
OAuth callback failed

Most Common Cause

You're trying to log in from the raw sandbox URL instead of the Manus Preview panel. OAuth authentication only works when accessing the app through the official Manus interface.

How to Fix This

  1. Go back to your Manus chat interface
  2. Click the "View" button on the project card
  3. This opens the Management UI with the Preview panel
  4. Log in from there - the OAuth callback will work correctly

Why this happens: The OAuth system is configured to work with the Manus-managed preview environment, not direct sandbox URLs. This is a security feature to ensure OAuth callbacks go to the correct domain.