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  • Last reply by Stans

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Hello. I cannot add gmail to Thunderbird. Windows 7, setting OAuth2, al is well until I allow TB to access my gmail account. Error following password check: "Unable to log in at server. Probably wrong configuration, username or password". No problems with Win 10. Same settings as in my Win 7 machine. Thank you for your help. Borys Brezden

Hello. I cannot add gmail to Thunderbird. Windows 7, setting OAuth2, al is well until I allow TB to access my gmail account. Error following password check: "Unable to log in at server. Probably wrong configuration, username or password". No problems with Win 10. Same settings as in my Win 7 machine. Thank you for your help. Borys Brezden

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Windows 7 is the problem. Gmail's OAuth2 won't work. You can use Normal Password authentication with an app-specific password instead.