Workaround:
Downgrade the ios simulator:
First install xcode-install gem:
gem install xcode-install
When check what iOS simulators are available:
xcversion simulators
Install desired simulator i.e:
xcversion simulators --install='iOS 13.5'
Use the ios 13.5 version to test and develop the apple sign in.
Than set the iOS Deployment Target to 13.5
Test your application with the apple sign in, upload, submit for review. And thats it, there will be no problem with the review.