I'm having the same issue.
It's quite frustrating and disappointing.
My app is being rejected because Apple Sign In is a requirement for App Store submissions with other 3rd party sign ins; yet Apple Sign in is unresponsive. So there seems to be no way forward.
It's rubbish and a huge waste of my time. Hard to look at Apple the same way.
Wisani
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This has been resolved on my end. Thanks to the resolving team.