Your documentation at https://help.yahoo.com/kb/new-yahoo-mail/imap-server-settings-yahoo-mail-sln4075.html on how to setup an email client (such as Thunderbird) to use the Yahoo email services is incomplete. Your documentation does not describe what the User Name for logging in should be, for example should it be just the username alone "name" or the full email address "name@yahoo.com".

Nor does your documentation describe what the authentication method should be set to. I am guessing OAuth2.

Something else is also missing because after trying all the variants of these parameters I still cannot get Thunderbird to receive or send email through the Yahoo email servers.