How to pause the game when the user receives a notification?

Hi, I am working on an app and I need it to call my pauseAfterNotif() method whenever the user receives a push notification (text message, instagram dm, etc.)

Here's what I have right now:

AppDelegate:

func applicationWillResignActive(_ application: UIApplication) {
        NotificationCenter.default.post(name: NSNotification.Name(rawValue: "goToBackground"), object: self)
        print("notif read")
    }

GameScene.didMove():

let notificationCenter = NotificationCenter.default
    notificationCenter.addObserver(self, selector: #selector(pauseAfterNotif), name: UIApplication.willResignActiveNotification, object: nil)

GameScene.pauseAfterNotif():

@objc func pauseAfterNotif() {
        if !isGamePaused {
                pauseGame()
                print("notif detected")
            }
        }

Right now, the code only executes when I exit the game and enter the homescreen or if I receive a call while playing. Is it possible to have it execute when I receive a push notification too?