Can't register for remote notifications

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?