Four months on and this is not fixed.
Very annoying as we are mandated to offer this capability and cannot test without a physical device.
SoftWyer
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This might be related -> https://developer.apple.com/forums/thread/651533
OS14.1 appears to have sign-in issues using a simulator. I suspect all the testers are using simulators because iPhones are too expensive :-D
Old question, but for reference I've not had a problem with an application requiring sign-in and presenting an initial login page.
It does offer a guest mode, and the now mandatory Apple Sign-In, but it has not been rejected because it needs a login.
(The guest mode was added after many users left 1 star reviews because it needed a sign-in :-/ )
@Dev1525
I've tried existing IDs, newly created IDs and test IDs on Simulators. None of them work.
Even before using 'Sign in with Apple' with your app the Accounts Settings fail as you mention. It doesn't seem to matter which ID I use with the simulator, that settings option always fails on OS14.1