A Microsoft file hosting and synchronization service.
hope you'll have the update soon. fyi I did; - disconnect all shared folders for all accounts 2-3weeks ago. and re-link but not solved. and I just waited. one day the symbol of onedrive (cloud, left of the win11 clock) shows eternal syncing as saying "60,000 files are now in sync" and I waited almost 24hours then all solved.
However I still have one shared folder that has malfunction, not accessible via FE, from another account.
hope helps.