Dear all,
This is a real issue in working. Our company provides office 365 mailbox and its lync for users.
Recently, many users meet such issue of " There was a problem acquiring a personal certificate required to sign in."
The lync version is 2010 and even I removed lync2010 cache for user's profile, that user still can't login lync.
See below picture.
Please give help and show advice.
Franklin hong