Signing in through Apple doesn't provide us with the email. This may be an issue in the future.

[bnhoang2k]

https://stackoverflow.com/questions/70264710/how-to-use-data-name-email-after-sign-in-with-apple-in-firebase https://stackoverflow.com/questions/74076596/why-is-firebase-not-getting-identifier-after-signing-in-with-apple https://stackoverflow.com/questions/75854662/firebase-issue-with-apple-sign-in-re-authentication

[bnhoang2k]

Another issue is that a user can create two accounts with the same email if they sign in through google and apple