I don't know how to configure Thunderbird 102
I have generated a security key. I have set up an account using IMAP.mail.att.net, port 993, connection security autodetect, authentication method autodetect and user name without @att.net On the outbound side I use SMTP.mail.att.net, port 465, autodetect, autodetect, username without @net. TB says it is looking up configuration and probing server. It's been doing it for 30 minutes. I used the security key as my password. I can access ATT mail via the web no issues.