Email failures with Google due to "invalid_grant" with "Token has been expired or revoked."

Email failures with Google due to "invalid_grant" with "Token has been expired or revoked."

If TopView is configured to email notifications with Google, you may receive email failures with an "invalid_grant" error message. The error may carry the description: "Token has been expired or revoked."

This can have a few causes:

1. The token got revoked by an administrator
   
2. The token got revoked automatically by Google's periodic renewal requirements
   
3. The token expired
   

The solution is to renew your application's access to Google by Signing into Google on the TopView email setting page(s) - either outgoing or incoming, whichever is in use.