无法在真实设备上获取FCM令牌，但正在模拟器上

我在没有可可豆荚的iOS应用程序中集成了Firebase云消息传递.Firebase分析工作正常.但是FCM令牌是在模拟器上收到的，而不是在真实设备上收到的.在真实设备上，我不断收到错误

I have integrated Firebase cloud messaging in my iOS application without cocoa pods. Firebase analytics is working fine. But FCM token is received on simulator but not real device. On real device I keep getting error

无法获取默认令牌错误Domain = com.firebase.iid代码= 501(空)"

Failed to fetch default token Error Domain=com.firebase.iid Code=501 "(null)"

1. 我已将.p12证书上传到Firebase上进行开发和生产
2. 我已经检查了我的应用和Firebase控制台上的捆绑包ID
3. 我在我的应用ID上启用了推送通知.

这是我的代码

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    [FIRApp configure];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(tokenRefreshNotification:)  name:kFIRInstanceIDTokenRefreshNotification object:nil];
}


- (void)application:(UIApplication *)application didRegisterUserNotificationSettings:(UIUserNotificationSettings *)notificationSettings {

    // For iOS 10 display notification (sent via APNS)
    [UNUserNotificationCenter currentNotificationCenter].delegate = self;
    // For iOS 10 data message (sent via FCM)
    [FIRMessaging messaging].remoteMessageDelegate = self;

    [application registerForRemoteNotifications];

}

- (void)application:(UIApplication *)app didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {

    [[FIRInstanceID instanceID] setAPNSToken:deviceToken type:FIRInstanceIDAPNSTokenTypeSandbox];

}

- (void)tokenRefreshNotification:(NSNotification *)notification {
    // Note that this callback will be fired everytime a new token is generated, including the first
    // time. So if you need to retrieve the token as soon as it is available this is where that
    // should be done.
    NSString *refreshedToken = [[FIRInstanceID instanceID] token];
    NSLog(@"InstanceID token: %@", refreshedToken);

    // Connect to FCM since connection may have failed when attempted before having a token.
    [self connectToFcm];

    // TODO: If necessary send token to application server.
}

- (void)connectToFcm {
    // Won't connect since there is no token
    if (![[FIRInstanceID instanceID] token]) {
        return;
    }

    // Disconnect previous FCM connection if it exists.
    [[FIRMessaging messaging] disconnect];

    [[FIRMessaging messaging] connectWithCompletion:^(NSError * _Nullable error) {
        if (error != nil) {
            NSLog(@"Unable to connect to FCM. %@", error);
        } else {
            NSLog(@"Connected to FCM. FCM token - %@", [[FIRInstanceID instanceID] token] );
        }
    }];
}


- (void)applicationDidBecomeActive:(UIApplication *)application {
    [FBSDKAppEvents activateApp];

    [self connectToFcm];

}

- (void)applicationDidEnterBackground:(UIApplication *)application {

    [[FIRMessaging messaging] disconnect];
    NSLog(@"Disconnected from FCM");

}

请帮助.