I am facing the same issue. Everything is working as expected until the user goes to iOS settings "Password & security" and presses the "Stop using Apple ID" button for our app. Then for any future manual sign in with that apple id (after user has logged out or reinstalled app, ...), the sign in also succeeds, but the email field in the sign in response is null and the identityToken is also a lot shorter and does not contain the email info anymore. I have no idea how I am able to access the email info for that apple id in the sign in flow of our app again. What am I doing wrong?