I encountered this issue aswell. I can't tell how long this issue is affecting me precisley. It got my attention while I was testing the new macOS catalina at work. But this overlapped with the new registrations / accounts for enpass.
What I can tell you now: None of my clients (2x Win10, 1x iOS 13, 1x macOS 10.15) has a working icloud sync anymore. Every client is showing the never ending loading sign (rotating circle spinner). I was already prompted on my Windows Clients and the macOS client to renew the icloud auth, but it didn't solved this issue.