Fixing iCloud “Unknown error occurred” & “Mac can’t connect to iCloud because of a problem” Errors

Some Mac users may encounter an error message stating “This Mac can’t connect to iCloud because of a problem with email@address.com”, which then directs the user to open the iCloud preferences. Once inside Mac iCloud preference panel, some users may be able to successfully login to iCloud, but often another error is encountered here which states “An unknown error occurred” when trying to login to iCloud on the Mac, or sometimes the iCloud preference panel freezes up and spins endlessly. Once these two error messages have been encountered, the Mac will typically be stuck in an infinite loop of iCloud login failures with an endless unknown error and the endless “problem” pop-up message, which prevents all iCloud functionality from working on the Mac including Messages, FaceTime, Notes, Mail, Contacts, Calendars, and all other iCloud related abilities.
















