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SwiftlyAdam

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

So this happened to me. To resolve it, I had to go to Xcode > Preferences > General tab. It then told me my session expired and to reenter my password for my account. Try that

Developer Tools & Services Apple Developer Program

Jun ’22

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

So this happened to me. To resolve it, I had to go to Xcode > Preferences > General tab. It then told me my session expired and to reenter my password for my account. Try that

Developer Tools & Services Apple Developer Program

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Activity: Jun ’22