ios13 - ASAuthorizationAppleIDRequest with name and mail scope returns nil values

Question

I'm implementing Sign in with Apple and noticed that the email and fullName properties of the returned ASAuthorizationAppleIDCredential are only filled on the very first Sign-In for this Apple ID. On all subsequent Sign-Ins those properties are nil.

Is this a bug on iOS 13 or expected behaviour?

Here is the code I'm using to start the request:

@available(iOS 13.0, *)
dynamic private func signInWithAppleClicked() {
    let request = ASAuthorizationAppleIDProvider().createRequest()
    request.requestedScopes = [.fullName, .email]

    let controller = ASAuthorizationController(authorizationRequests: [request])
    controller.delegate = self
    controller.presentationContextProvider = self
    controller.performRequests()
}

I'm receiving the credential in this delegate method:

public func authorizationController(controller: ASAuthorizationController, didCompleteWithAuthorization authorization: ASAuthorization) {
    guard let credential = authorization.credential as? ASAuthorizationAppleIDCredential else { return }

    let userIdentifier = credential.user
    let token = credential.identityToken
    let authCode = credential.authorizationCode
    let realUserStatus = credential.realUserStatus
    let mail = credential.email // nil
    let name = credential.fullName // nil
}

Answer 1

Seems like a bug but after reading different posts on apple forums it looks like this seems to be the expected behaviour.

So some takeaways.

1. On the first time sign in with apple (signup) make sure to create user account on your backend.

2. In case of any connection error with your servers, make sure you save the user details locally (because you are not getting this next time) and keep retrying to create account on your backend.

3. For testing on device you can revoke your apple ID login for your app. After revoking it will work like a signup next time and you will get the details like (email, name, etc).

To revoke access on your device with IOS 13.

iPhone Settings > Apple Id > Password & Security > Apple ID logins > {YOUR APP} > Stop using Apple ID