NotificationCenter.observer not listening to Notifications

Question

I am facing a frustrating issue with NotificationCenter and I can't find what is wrong with my code. I don't know if there are any other settings to it but somehow my notificationcenter is either not firing or the observer is not listening to the notification.

I have in my viewcontroller1.swift

@IBAction func onButtonPressed(_ sender: Any) {
        NotificationCenter.default.post(name: .namePassedNotification, object: self)
    }

and in my viewcontroller2.swift

    override func viewDidLoad() {
        super.viewDidLoad()

        NotificationCenter.default.addObserver(self, selector: #selector(handleNotification), name: .namePassedNotification, object: nil)
    }

    @objc func handleNotification()
    {
        view.backgroundColor = .black
    }

I've tried everything I can think of or find here on stackoverflow but nothing seem to work