I have this same issue on my 3 PCs last days, all are Windows 10.
Tried to set up sync again, and then it syncs OK for some minutes/time, but later same day (not very long) it is the same on each PC.
Uninstalled Enpass, and installed it fresh on my work-PC this morning in desperation, but did not resolve it.
Even tried removing whole apps/Enpass-folder from onedrive, importing backup, and setting up onedrive-sync from scrath (done so today on my work PC). But issue is back now when I tried to use enpass an hour later.
To make it clear; Sync is working when I remove it, and then add it again...but some minutes/hours later I come back to enpass, and now I have the error "No data found on Onedrive", and some message about it thinking that I have actively deleted files. But when I check apps/Enpass-folder on OneDrive it seems to me that the files are there. The message about enpass believing I have actively deleted files I have not seen today, but can add screenshot when I see it again.