Error "Your migration failed checking source credentials. Cannot connect to Drive API: Error:"unauthorized_client", Description:"Client is unauthorized to retrieve access tokens using this method.", Uri:"""
This error occurs in a Google Drive migration when Enable API Access has not been enabled in the Google Admin Portal.
To enable API Access, follow these steps.
- Log in to the Google Admin Portal
- Click on Security
- Click on API Reference
- Check the box for Enable API Access
Note: This step is required for both the Source and Destination Admin Portals when migrating from Google Drive to Google Drive.