前提・実現したいこと

Flutter とFirebase Authを使ってログインできるようにしたいです。
APNのkeyを追加する前は普通にできていましたが、（push notification)をするためにAPNのKeyを追加したら以下のエラーメッセージが発生してしまいました。

APNを追加する前までは正常に動いていたのにとても謎です。助けてください。

発生している問題・エラーメッセージ

2020-03-15 13:14:28.499404+0900 Runner[9396:1934301] flutter: Token mismatch

自分のコード


  Future<void> verifyPhone() async {
    print('veryfy phone func');
    FirebaseAuth.instance.signOut();
    print('veryfy phone func');

    final PhoneCodeAutoRetrievalTimeout autoRetrieve = (String verId) {
      this.verificationId = verId;
      FirebaseAuth.instance.currentUser().then((user) {
        if (user != null) {
          print(user.phoneNumber);
          print(user.uid);
        } else {}
      });
    };

    final PhoneCodeSent smsCodeSent =
        (String verId, [int forceCodeResend]) async {
      this.verificationId = verId;
      await smsCodeDialog(context).then((value) {
        print('signed in');
      });
    };

    final PhoneVerificationCompleted verificationSuccess =
        (AuthCredential user) {
      print('Phone Verification Completed');
    };

    final PhoneVerificationFailed verificationFailed =
        (AuthException exception) {
      print('${exception.message}');
    };

    await FirebaseAuth.instance.verifyPhoneNumber(
      phoneNumber: this.phoneNo,
      codeAutoRetrievalTimeout: autoRetrieve,
      codeSent: smsCodeSent,
      timeout: const Duration(seconds: 60),
      verificationCompleted: verificationSuccess,
      verificationFailed: verificationFailed,
    );
  }

  Future<bool> smsCodeDialog(BuildContext context) {
    return showDialog(
        context: context,
        barrierDismissible: false,
        builder: (BuildContext context) {
          return new AlertDialog(
            title: Text('認証コードを送信しました。'),
            content: PinInputTextField(
              onChanged: (value) {
                this.smsCode = value;
              },
              decoration: UnderlineDecoration(),
            ),
            contentPadding: EdgeInsets.all(10),
            actions: <Widget>[
              FlatButton(
                child: Text('Done'),
                onPressed: () {
                  FirebaseAuth.instance.currentUser().then((user) async {
                    if (user != null) {
                      print(user.phoneNumber);
                      print(user.uid);
                      final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();
                      _firebaseMessaging.getToken().then((token) {
                        print('token: $token');
                        Firestore.instance.collection('users').document(user.uid).collection('token').document('token')
                            .setData({'pushToken': token});
                      }).catchError((err) {
                        Fluttertoast.showToast(msg: err.message.toString());
                      });

                      Navigator.of(context).pop();
                      Navigator.of(context).pushReplacementNamed('/');

                      print("user exists!");
                    } else {
                      print("good! first user");

                      signIn();
//                      print(user.uid);
                    }
                  });
                },
              )
            ],
          );
        });
  }

  signIn() async {
    final AuthCredential credential = PhoneAuthProvider.getCredential(
        verificationId: verificationId, smsCode: smsCode);
    print(credential);

    AuthResult authResultJustForNewUser =
        await FirebaseAuth.instance.signInWithCredential(credential);
    final some = authResultJustForNewUser.additionalUserInfo.isNewUser;

    print(some);

    print("before add");
    AuthResult authResult = await FirebaseAuth.instance
        .signInWithCredential(credential)
        .then((user) {
    }).catchError((e) {
      print('Auth Credential Error : $e');
    });
    final FirebaseMessaging _firebaseMessaging = FirebaseMessaging();

    FirebaseAuth.instance.currentUser().then((user) {
      print('user.id is : ${user.uid}');
      print(user.phoneNumber);
      print('printing uid and phonenumber');

      _firebaseMessaging.getToken().then((token) {
        print('token: $token');
        Firestore.instance.collection('users').document(user.uid).collection('token').document('token')
            .setData({'pushToken': token});
      }).catchError((err) {
        Fluttertoast.showToast(msg: err.message.toString());
      });
      funcPost(
          username: "natsuki", password: user.phoneNumber, hash_id: user.uid);
    });
  }

やったこと：
アプリを一度削除
flutter clean
build を削除
APN key からAPN certificateに変更