Android 为什么当我在装有Firebase的安卓系统中登录苹果时，收到的邮箱为空

每当我登录苹果时，我都会收到一封null的邮箱.请注意，显示名称不为空.此外，在try 再次登录苹果之前，我已经确保取消所有令牌，因为据我所知，苹果只提供一次邮箱，在首次注册时.以下是我在装有Firebase的安卓系统中登录苹果的代码:

OAuth提供程序:

fun appleOAuthProvider(appLanguage: String): OAuthProvider {

    return OAuthProvider
        .newBuilder("apple.com")
        .setScopes(listOf("name", "email"))
        .addCustomParameter("locale", currentLanguageLocale(appLanguage))
        .build()

} //: FUN

登录:

private fun singInUser(
    auth: FirebaseAuth,
    context: Context,
    appLanguage: String,
    isSigningIn: MutableState<Boolean>,
    completion: (FirebaseUser?) -> Unit
) {

    auth
        .startActivityForSignInWithProvider(context.getActivity(), HelperFunctions.appleOAuthProvider(appLanguage))
        .addOnSuccessListener { authResult ->

            Log.d("SIGN IN WITH APPLE", "activitySignIn:onSuccess:${authResult.user}")
            completion(authResult.user)

        } //: ON SUCCESS

        .addOnFailureListener { e ->

            Log.w("SIGN IN WITH APPLE", "activitySignIn:onFailure", e)
            isSigningIn.value = false
            completion(null)

        } //: ON FAILURE

} //: FUN

登录后，我用之前获得的authResult.user个数据收集用户的数据:

private fun collectDataFromApple(
    user: FirebaseUser?,
    completion: (SignInResult) -> Unit
) {

    val uid = user?.uid
    val email = user?.email
    var firstName = separatedFullName(user?.displayName)?.get(0)
    var lastName = separatedFullName(user?.displayName)?.get(1)

    if (firstName.isNullOrEmpty()) {
        firstName = lastName
    } else if (lastName.isNullOrEmpty()){
        lastName = firstName
    }

    completion(
        SignInResult(
            data =
            UserData(
                personalInformation = UserData.PersonalInformation(
                    userID = uid,
                    email = email,
                    firstName = firstName,
                    lastName = lastName,
                    imageBitmap = null,
                    isNewUser = true,
                    isEmailVerified = mutableStateOf(true),
                    firebaseHasData = false
                ),
                addressInformation = UserData.AddressInformation(),
                contributeStatistics = UserData.ContributeStatistics()
            ),
            errorMessage = null
        )
    )

} //: FUN

由于未知原因，user?.email返回空值.然而，firstName和lastName不是空的.为什么会这样呢？