Getting 401 Error Unauthenication for some users
We are using a service account to access / use the new GMail API to manage Signatures in a clients GSuite Domain. Some users we bet perfect validation, and others we get a 401 error. All in the same domain, same settings etc. The same users get the same validation results every time. User A always validates and user B does not.
When we comment out the two scopes in the API Access (https://www.googleapis.com/auth/gmail.settings.basic and https://www.googleapis.com/auth/gmail.settings.sharing) then all the users validate.
Any ideas or help would be much appreciated.