Seeing the same issue. Working fine on iOS/iPadOS beta.
Similar issue - iMessage is not functional due to authentication issue
Same here folks....
MBA Mid 2012, brand new install of macOS Catalina (V 10.15), and :
- iPhone visible on Finder;
- "Settings / Internet Accounts / iCloud" showing pretty much everything pretty much equal as on my other Mac which is a MBP Early 2013 running macOS Mojave (V10.14.6);
Both iMessage and Facetime are working just fine on my iPhone, iPad and on my MBP Early 2013 running macOS Mojave.
BUT, if I try to login to either iMessage or Facetime Apps in order to get them configured and running, it's like it's going nowhere. No errors, no messages, nothing to troubleshoot or search for.