HttpError 403 when requesting https://www.googleapis.com/discovery/v1/apis/gmail/v1/rest returned “The caller does not have permission”

Question

I have been using Gmail API to automatic email processing in production for many months now. All of a sudden since July 2, 2020 seeing the error message trying to access Gmail API.

HttpError 403 when requesting https://www.googleapis.com/discovery/v1/apis/gmail/v1/rest returned "The caller does not have permission"

Checked Gmail Dashboard and the credentials are active noting was removed or modified.

Checked code and can confirm nothing changed for 3-4 months.

And we are not using old token. Our code takes care of expired credentials and does a token refresh.

Also tried removing the token.pickle file, when rerun re-authenticated using the Gmail Auth screen and token.pickle file is recreated however the error message cannot be resolved.

It looks like something changed in Google's end.

Can someone please confirm?

When doing a search seems lot of ppl are seeing this in various APIs recently but no viable solution is provided.

Answer 1

This is a system-wide issue on Google's side: https://issuetracker.google.com/issues/160441983

Answer 2

logged against python api here: https://github.com/googleapis/google-api-python-client/issues/959 . they seemed to be responsive before

Answer 3

There is a workaround using a local copy of the discovery json file posted in the thread yihlamur linked: https://issuetracker.google.com/u/1/issues/160441983#comment73 . The workaround was successful for us.

Answer 4

I had this issue yesterday aswell. The issue has since been resolved. See - https://issuetracker.google.com/issues/160441983