A year ago I set one drive to sync to my micro SD card on a.Surface 3. Now I get error messages that the target location isn't NTFS. So how did it work before and can I send it to sd card again?
As far as i know, One drive location can be moved to sd card only if the format is NTFS. I suggest you to backup every of your data and then format it to NTFS. Try to move the location to sd card and see if its worked.