Firebase Cloud Messaging is not working on iOS 12 - ios

Question

I have set up everything according to https://firebase.google.com/docs/cloud-messaging/ios/client#method_swizzling_in
However, I am not receiving any messages.
My APN certificate (p.12) expired, I had to add a new APN key (p.8) (I think there is no issue here.)
I am not receiving anything in my log, after the app enters background.
Also, there are no error messages.
I am confused, it used to work on iOS 11.
What is my mistake here?
#implementation AppDelegate
NSString *const kGCMMessageIDKey = #"gcm.message_id";
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
NSLog(#"APPDIDFINISHLAUNCH called with options: %#", launchOptions);
[FIROptions defaultOptions].deepLinkURLScheme = #"xxxxx";
[FIRApp configure];
[FIRMessaging messaging].delegate = self;
[[FIRInstanceID instanceID] instanceIDWithHandler:^(FIRInstanceIDResult * _Nullable result,
NSError * _Nullable error) {
if (error != nil) {
NSLog(#"Error fetching remote instance ID: %#", error);
} else {
NSLog(#"Remote instance ID token: %#", result.token);
NSString* message =
[NSString stringWithFormat:#"Remote InstanceID token: %#", result.token];
}
}];
if ([UNUserNotificationCenter class] != nil) {
[UNUserNotificationCenter currentNotificationCenter].delegate = self;
UNAuthorizationOptions authOptions = UNAuthorizationOptionAlert |
UNAuthorizationOptionSound | UNAuthorizationOptionBadge;
[[UNUserNotificationCenter currentNotificationCenter]
requestAuthorizationWithOptions:authOptions
completionHandler:^(BOOL granted, NSError * _Nullable error) {
}];
} else {
UIUserNotificationType allNotificationTypes =
(UIUserNotificationTypeSound | UIUserNotificationTypeAlert | UIUserNotificationTypeBadge);
UIUserNotificationSettings *settings =
[UIUserNotificationSettings settingsForTypes:allNotificationTypes categories:nil];
[application registerUserNotificationSettings:settings];
}
[application registerForRemoteNotifications];
}
- (void)application:(UIApplication *)application
didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
[FIRMessaging messaging].APNSToken = deviceToken;
NSLog(#"ssaging messaging].APNSToke");
}
- (void)messaging:(FIRMessaging *)messaging didReceiveMessage:(FIRMessagingRemoteMessage *)remoteMessage {
NSLog(#"didReceiveMessage: %#", remoteMessage);
}
- (void)messaging:(FIRMessaging *)messaging didReceiveRegistrationToken:(NSString *)fcmToken {
NSDictionary *dataDict = [NSDictionary dictionaryWithObject:fcmToken forKey:#"token"];
[[NSNotificationCenter defaultCenter] postNotificationName:
#"FCMToken" object:nil userInfo:dataDict];
}
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler {
completionHandler(UIBackgroundFetchResultNewData);
}
I am happy for any help.