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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.

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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.

Dharman
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KosiB
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4 Answers4

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

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

amohr
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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.

alex83
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I had this issue yesterday aswell. The issue has since been resolved. See - https://issuetracker.google.com/issues/160441983

Drew Hopkins
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