A Microsoft file hosting and synchronization service.
I am seeing the same issue as of around 9 am Eastern time in the U.S. on 12/7/24.
Same issue of getting to point of popup after trying to access my Personal Vault and have tried multiple authentication modes. Just hangs and no access.
Tried the mobile app which I never used, was able to access for a short time, but then five minutes later could not even access my most basic Personal Drive.
Very frustrating.