Hi,
same here. Turning on Advanced Data Protection for iCloud breaks the enpass icloud sync on Mac's. iOS and ipadOS works.
Seems there is something wrong with the enpass cloudKit implementation (or they are not using the cloudKit API in the desktop apps?). They always have had also the freeking session expire problem on icloud sync in there desktop apps, which also never happens in the iOS apps.
Best regards
Ossi