Sign in with Apple

Hello,
Our team would like to use Sing in with Apple feature in the app.
We faced an interesting situation.
When a user deletes an account in the app and trying to Sign in with Apple again he/she gets an error.
Details:
  • In registration with Apple we can get: fullName, email, identityToken.

  • In a login with Apple we can get only: identityToken.

Problem:
  • When the user taps on the Sign in with Apple again we can only get identityToken and pass it to Backend.

  • When identityToken is passing to wp-json/mobile-api/user/login request Backend assess this procedure as login. And since this user's account in the app has been deleted he/she gets an error.

Is there any suggested route with the help of an API or other method to disassociate a user’s Apple account with the app on a developer’s side?