Recent Thunderbird updates broke OAUTH2 and this seems to be a common problem
with Thunderbird 102. With this update it no longer presents an OAUTH2 dialog
for IMAP. My employer uses Microsoft Office365 and OAUTH2 is essential. This
used to work. Even with a clean install and nuking the previous configuration
it will never prompt for OAUTH2 authentication like it used to. Note that the
OAUTH2 dialog DOES work with SMTP, but not IMAP.

Searching the Internet reveals that this is a common problem with this release.

Please upgrade Thunderbird to a newer release for 15.4. I'm not quite ready to
upgrade to 15.5 just yet since I use this machine for heavy development work.