A Microsoft file hosting and synchronization service.
Hi,
Did you recently sign in to a new device or see a message about OneDrive backup turning on?
The only reliable recovery steps now are to check OneDrive on the web for both the Recycle Bin and Second-stage Recycle Bin, then use “Restore your OneDrive” from Settings to roll back to a date before the files disappeared, and confirm you are signed into the correct account since files sometimes show under a different account after sync changes.
If the files are not in either recycle bin and restore has no earlier point, then the service no longer has a copy and recovery is not possible through OneDrive.