I've got a code that was making a successful registration for remote messages a few weeks ago. Here's how it was looking like: func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool { registerForRemoteNotifications(application: application) return true } func registerForRemoteNotifications(application: UIApplication) { UNUserNotificationCenter.current().delegate = self let authOptions: UNAuthorizationOptions = [.alert, .badge, .sound] UNUserNotificationCenter.current().requestAuthorization( options: authOptions, completionHandler: { _, _ in } ) application.registerForRemoteNotifications() } func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) { print(deviceToken) } A few weeks ago the didRegisterForRemoteNotificationsWithDeviceToken method was calling after registration, but now neither didRegisterForRemoteNotificationsWithDeviceToken or didFailToRegisterForRemoteNotification methods are called. Why could this happen?