Skype4Business Crash In Windows 11, But Is Fine On Windows 10 Machines

Hi Community,

I'm trying to support one colleague with very unusual Skype4Business (part of Office 2016 Pro.) crash issue.

After user has successfully launched and login at S4B, the app will crash and disappear in less than a minute. We've tried some remediation steps, but still unable to determine the cause of the crashes.

1. Re-formatted user's laptop again, then applied all Windows 11 and Office updates, but her S4B profile still crashed.
2. Tried her S4B login to different Windows 11 machine, and S4B app still crashed in less than a minute.
3. Other users tested on her Windows 11 laptop have no issue, as S4B app do not crash.
4. If we test her S4B login at other Windows 10 machines, surprisingly S4B does not crash - so crashes only happen on Windows 11 machines

The affected Skype4B build number is 16.0.4266.1001.

We collected ".UccApilog" logs when her S4B app/profile crashed in Windows 11 - is this Forum the correct place to share the Skype log ?

Thank you.