iOS 8/9/10 background notification delegate method not working

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I have implemented a custom push handler that conforms to the "UAPushNotificationDelegate" protocol . It has these methods similar to sample urban airship application .

-(void)receivedBackgroundNotification:(UANotificationContent *)notificationContent completionHandler:(void (^)(UIBackgroundFetchResult))completionHandler {
// Application received a background notification
UA_LDEBUG(@"The application received a background notification");

// Call the completion handler
completionHandler(UIBackgroundFetchResultNoData);
}

-(void)receivedForegroundNotification:(UANotificationContent *)notificationContent completionHandler:(void (^)())completionHandler {
completionHandler();
}

-(void)receivedNotificationResponse:(UANotificationResponse *)notificationResponse completionHandler:(void (^)())completionHandler {
completionHandler();
}

- (UNNotificationPresentationOptions)presentationOptionsForNotification:(UNNotification *)notification {
return UNNotificationPresentationOptionAlert | UNNotificationPresentationOptionSound;
}

but receivedBackgroundNotification method is not firing when I get a background notification. I can see the push notification pop up.
I really want to make this work as I'm trying to add app icon badges manually as I'm working out of your inbox.

thanks in advanced.