Group Gator's services scopes have changed since you originally authorized them. As a result, you should be requested to re-authorize the application with its new required permissions. You’ll need to remove Group Gator’s permission then reauthorize.
To remove permission and reauthorize:
- Navigate to this page: https://myaccount.google.com/permissions
- Click the Group Gator app.
- Click Remove.
- Then, navigate here and re-authorize the Group Gator Service using your Super admin account.
Once you've done this, the Delegation Service should be available once again.