Is there a way around to this problem ? I am facing similar issue on BigSur 11.4 Safari Version 14.1.1 (16611.2.7.1.4)

We are to able to extract email from identity token in subsequent api call as mentioned in documentation. However it is encouraged that you use user identifier to uniquely identify users. While Apple provides the user’s email address in the identity token on all subsequent API responses, it doesn’t include other information about the user, such as their name. When you receive user information from the API response, immediately store it locally so your app can access it again in the event of a process or network failure. https://developer.apple.com/documentation/sign_in_with_apple/sign_in_with_apple_rest_api/authenticating_users_with_sign_in_with_apple#:~:text=While%20Apple%20provides,or%20network%20failure.