I had that, and it seems to have been connected to the iCloud Keychain which need a whole lot of time (and in my case at least two to three tries) to start up.Hello, already installed GM version of Catalina.
All works fine without one exception.
Apple ID panel in System Preferences is asking me repeatedly for a Apple ID password.
Once I provided Apple ID password and computer password, then after a while it is asking again and again without stop.
[...]
Does any one have this issue too? Maybe someone knows how to fix it?
See if System Preferences > Apple ID > iCloud > Apps using iCloud > Keychain is checked or not.
Edit: I an crossing my fingers that starting the iCloud Keychain really has fixed that issue...
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