This weekend I had the same sync-error. I tried to disconnect and connect again with One-Drive, but this was mot the solution. In my opinion Microsoft has changed something in their interface. I tried to make changes in my account, but I had to verify myself by a number, sent to me with SMS, Their number contained 7 digits!. When I tried to fill this on their website, it seemed to be an error, because the number has to contain 8 digits. I was so frustrated with these Microsoft account, that I changed it in Enpass to sync with a Google-cloud. Afterwards I made a login to my One-Drive and have deleted the Enpass entry . Now it works fine without One-Drive!!