Hi all, As part of development for my app I'm wanting to utilise the Apple Push Notification service. For now, I have implemented the necessary code in an app delegate class which you can see below class AppDelegate: UIResponder, UIApplicationDelegate, UNUserNotificationCenterDelegate { var window: UIWindow? func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool { // Request permission to display alerts and play sounds. let center = UNUserNotificationCenter.current() center.requestAuthorization(options: [.alert, .sound, .badge]) { (granted, error) in if granted { DispatchQueue.main.async { application.registerForRemoteNotifications() } } } // Set the delegate for the UNUserNotificationCenter UNUserNotificationCenter.current().delegate = self return true } // MARK: - APNs Registration func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) { let tokenParts = deviceToken.map { data in String(format: "%02.2hhx", data) } let token = tokenParts.joined() print("Device Token: \(token)") // Send or save this token as necessary. } func application(_ application: UIApplication, didFailToRegisterForRemoteNotificationsWithError error: Error) { print("Failed to register for remote notifications with error: \(error.localizedDescription)") } // MARK: - UNUserNotificationCenterDelegate Methods // Called when a notification is delivered to a foreground app. func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) { completionHandler([.banner, .sound]) print("message received!!") } // Called when a user taps on a notification. func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) { print("user tapped on banner!!") completionHandler() } // Called when a notification is delivered in the background func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) { if let messageData = userInfo["yourKey"] as? [String: AnyObject] { print("Background Notification received!!") print(messageData) completionHandler(.newData) } else { completionHandler(.noData) } } } To test this, I've just been using the terminal Like so: curl -v \ --header "authorization: bearer $JWT" \ --header "apns-topic: $TOPIC" \ --header "apns-push-type: alert" \ --http2 \ --data '{"aps":{"alert":"Hello from Terminal!", "content-available":1}}' \ $APNS_ENDPOINT/3/device/$DEVICE_TOKEN However, despite including the "content-available" tag the didReceiveRemoteNotification function is not being called. Any idea why this is? I have made sure that all the necessary capabilities have been included (background fetch, remote notifications).