The operation couldn’t be completed. Unable to log in with account 'myappleid'. An unexpected failure occurred while logging in (Underlying error code 1100).解决方法

I had to go to "Preferences" -> "Accounts", where it turned out my Apple ID had timed-out. After logging-in there, and then restarting Xcode, my profile was automatically "repaired", and all is now well.

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