Dev 463 was out yesterday, have you tried it with the Mail app?
I'm currently on the last beta build.
No difference unfortunately. Still no mention of the problem in the release notes either.
I was on Win 10 19043 and just did an install upgrade to the new Dev build 22489.
Still having the same exact problem, that my IMAP Email account will no longer Sync.
Resetting the Mail app does not fix it.
This issue only appears to be with the Dev builds, as the regular Win 11 Release/PreRelease/Beta builds are working fine with the Mail app and my IMAP account.