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Only heard of this on local clients. Server level

Same issue on other users containers, no issue when deleting a file from local drive or local profiles. User logged on trying to delete a file in AppData/Roaming for example.

Ok so when the profile is mounted then. So you can delete files here C:\Users\local_username and not here C:\Users\lusername. Or u cant in both?

Delete works in local_username, throw the error in username folder Shift-Delete works in both

Shift-Delete bypasses the recycle bin, so it sounds like they don't have permissions to move a file into the bin. Check to see if the user has modify rights to their recycle.bin file at the root of the profile. If permissions need to be reset on the recycle bin, take the profile offline, mount the disk, and delete the file. (Assuming profile disk is mounted to o:\)

gci 'O:\$recycle.bin' -Hidden
rmdir 'O:\$recycle.bin' -Recurse -Force

Remove the drive letter and dismount the profile disk. When the user logs in next, windows explorer will recreate the recycle.bin object with default permissions.

No $RECYCLE.BIN folder when mounting profile disk, no such folder at the root of the profile

For FSLogix after you mount the disk, there is a "Profile" folder, inside that folder should be a file called "$Recycle.bin", on a microsoft UPD is it at the root of the disk, my bad.

Volume is healthy, support case opened. Thank you very much for these suggestions !