Apple Sign in not working on iPad(6th generation) running iOS 13.6 on Wifi

I implemented 'Sign in with Apple' feature in my application taking reference from here: https://developer.apple.com/documentation/authenticationservices/implementing_user_authentication_with_sign_in_with_apple
Everything seem to work fine when I test for my iPhone 11 running iOS 13.3. I also tested on iPad(6th generation) simulator. I have handled both cases when we get email and name at first place and when do not email/name. All the cases work fine.
I submitted for App Store review and they report me this. I am stuck and unable to find why they are getting this issue
I'm having the same issue, any solution?
Apple Sign in not working on iPad(6th generation) running iOS 13.6 on Wifi
 
 
Q