I updated my MacBook Pro to macOS Mojave. Everything was working fine except iCloud, it was not synchronizing data.
So I thought I sign out and back in.
But if I try to sign in, the wheel spins, and after a while it goes back to the original screen where you have to enter your Apple ID without error message.
After trying a restart, deleting cache etc. I created a new user, here everything is working.
But I want it working with my original account with all my data.