Cannot connect to Drive API


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.
Note: Google has limited this setting to G Suite Super Administrators only.

  1. Log in to the Google Admin Portal
  2. Click on Security
  3. Click on API Permissions.
  4. Make sure that Drive is marked Enable.


  • This step is required for both the Source and Destination Admin Portals when migrating from Google Drive to Google Drive.  
  • For best results, we suggest following the steps in this article to make sure that all access needed is granted to the migration account: Enable access to G Suite (IMAP) using OAuth 2.0
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