TB 91.7.0 on RHEL7 just downloaded from mozilla. I have TB working on two Ubuntu 20.04 machines at home from the ppa. I tried using our older TB 19.4.x version from our yum repo here, but although I could create my gmail account on TB there, I could not use openPGP I ''think'' because RHEL7 doesn't include some pgp library or the other: I'm not sure. Anyway, that's why I thought I would try the 91.7 tarball downloaded from mozilla. I was able to add a privateemail.com email account without any problems. Unrelated, but a relief to me: OpenPGP works fine here, too. But when I try to add my gmail account here, it whines: ''Unable to log in at server. Probably wrong configuration, username or password.'' I use 2FA for my google accounts. Most of my searching around for answers deal with old answers and generally involve making sure OAuth2 is enabled. If I click on "configure manually", it shows me that OAuth2 is selected. IMAP lists imap.gmail.com:993 SSL/TLS OAuth2. SMTP shows smtp.gmail.com:465 SSL/TLS OAuth2. These were auto-discovered by TB. They look like what I remember from setting up on Ubuntu. Any suggestions?