Comment 17 for bug 1850651

After setting mail.wizard.logging.dump to 'all' and mail.wizard.logging.console to 'all', when Thunderbird makes a request to https://www.googleapis.com/oauth2/v3/token the response is '400 bad request' with {"error": "invalid_grant", "error_description": "Malformed auth code."}

https://blog.timekit.io/google-oauth-invalid-grant-nightmare-and-how-to-fix-it-9f4efaf1da35

Googling makes it sound like it's a generic error that can apply to any number of scenarios. So I don't know. Maybe Fallen has some idea what could be going on here? Do we have Google contacts we can ask about this?

As of this moment, gmail auth is broken for all users and the error message may as well be 'something is wrong'.