Flutter中Apple登录无法稳定获取用户姓名问题求助

我在实现Apple登录功能时遇到一个问题：无法从Apple凭证中稳定获取用户全名，目前只能稳定拿到邮箱信息。只有当用户在设备上重新登录Apple账号后，才能获取到全名；如果设备上的Apple账号保持登录状态，姓名字段就会返回null。

这是我的Apple登录功能代码：

signInWithApple(Ref ref) async {
    try {
      final FirebaseAuth auth = FirebaseAuth.instance;
      final AuthorizationCredentialAppleID appleCredential =
          await SignInWithApple.getAppleIDCredential(
        scopes: [
          AppleIDAuthorizationScopes.email,
          AppleIDAuthorizationScopes.fullName
        ],
        webAuthenticationOptions: WebAuthenticationOptions(
          clientId: 'clientId',
          redirectUri: Uri.parse('uri'),
        ),
      );
      final OAuthProvider oAuthProvider = OAuthProvider('apple.com');
      final credential = oAuthProvider.credential(
          idToken: appleCredential.identityToken,
          accessToken: appleCredential.authorizationCode);
      final User? user = (await auth.signInWithCredential(credential)).user;
      if (user?.email != null) {
        ref
            .read(authProvider.notifier)
            .setAppleEmailToRegistration(user!.email!);
        final Either<CleanFailure, EmailLoginSecondStepResponse> data =
            await api.post(
          fromData: (json) => EmailLoginSecondStepResponse.fromMap(json),
          endPoint: APIRoute.socialLogin,
          body: {"email": user.email},
          withToken: false,
        );
        return data;
      } else {
        return left(
          CleanFailure.withData(
            tag: "Apple sign-in error",
            url: "apple.com",
            method: "POST",
            statusCode: 000,
            header: const {},
            body: const {},
            error: const CleanError(
              message: "Apple sign-in error",
            ),
          ),
        );
      }
    } catch (e) {
      Logger.e("Apple sign in error: $e");
      return left(
        CleanFailure.withData(
          tag: "Apple sign-in error",
          url: "apple.com",
          method: "POST",
          statusCode: 000,
          header: const {},
          body: const {},
          error: CleanError(
            message: e.toString(),
          ),
        ),
      );
    }
  }

恳请各位帮忙解决这个问题！

内容的提问来源于stack exchange，提问作者Nazmul Hasan