Your account in OverOps was originally setup with an email address which domain authenticated against Google. Since then we moved to a different domain and I can no longer login to OverOps via Sign in with Google or via email.
SaaS: all versions
Logout of OverOps and follow the Forgot Password link.
Set a new password and login with email and your new password without clicking on Sign in with Google.
The reset link is sent to you via email. You still need to be able to access emails send to your old email domain.
Google can no longer authenticate your domain email address. By setting a password you can bypass Google.com and login directly into OverOps.