Only iMac won't connect to iCloud
Have iPhone, iPad, iBook and iMac. Now all of a sudden the iMac won't connect to iCloud. I get an error that says "This Mac can't connect to iCould because of a problem with (user name"). I've gone through all the verification of answering security questions, birthdate etc. and that didn't work. I've tried changing my password which had to be change on my 3 other devices, but that doesn't work. Had anyone else encounter this problem and were you able to resolve it? I am using the latest system software on all my devices.
iMac 21.5", macOS 10.14