Here you can see the OAuth attempt fail -1804604608[96cfdd80]: try to log in -1804604608[96cfdd80]: IMAP auth: server caps 0xc080c1625, pref 0x800000000, failed 0x0, avail caps 0x800000000 -1804604608[96cfdd80]: (GSSAPI = 0x1000000, CRAM = 0x20000, NTLM = 0x100000, MSN = 0x200000, PLAIN = 0x1000, LOGIN = 0x2, old-style IMAP login = 0x4, auth external IMAP login = 0x20000000, OAUTH2 = 0x800000000) -1804604608[96cfdd80]: trying auth method 0x800000000 -1804604608[96cfdd80]: IMAP: trying auth method 0x800000000 -1804604608[96cfdd80]: XOAUTH2 auth -1804604608[96cfdd80]: OAuth2 failed -1804604608[96cfdd80]: authlogin failed -1804604608[96cfdd80]: marking auth method 0x800000000 failed
If there is something else you are looking for I'll need help knowing what to search for. Be aware you won't be able to reproduce this problem with a gmail account that is already authenticated over oauth. You have to clear that authentication first somehow. In my case it was a password reset, but I suppose you could also create a temporary profile and try to recreate the Thunderbird/Icedove account. Some of the other bug reports I linked to indicate this may not be problem in some countries (I am in the USA). Perhaps having something to do with the sign-in portal used.
