ReplayKit doesn't work in iOS sample SpriteKit project code

Question

I am using the sample SpriteKit project in Xcode to test ReplayKit but it just displays the normal app without the without the navigationItem.rightBarButtonItem appearing. Just the black screen with the Hello, World! label. I'm not sure what I am missing. Below is the GameViewController class details.

import UIKit
import SpriteKit
import GameplayKit
import ReplayKit

class GameViewController: UIViewController, RPPreviewViewControllerDelegate {

 //weak var previewControllerDelegate: RPPreviewViewControllerDelegate?

override func viewDidLoad() {
    super.viewDidLoad()



    navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Start", style: .plain, target: self, action: #selector(startRecording))


    if let view = self.view as! SKView? {
        // Load the SKScene from 'GameScene.sks'
        if let scene = SKScene(fileNamed: "GameScene") {
            // Set the scale mode to scale to fit the window
            scene.scaleMode = .aspectFill

            // Present the scene
            view.presentScene(scene)
        }

        view.ignoresSiblingOrder = true

        view.showsFPS = true
        view.showsNodeCount = true

    }



}


func startRecording() {
    let recorder = RPScreenRecorder.shared()

    recorder.startRecording{ [unowned self] (error) in
        if let unwrappedError = error {
            print(unwrappedError.localizedDescription)
        } else {
            self.navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Stop", style: .plain, target: self, action: #selector(self.stopRecording))
        }
    }
}

func stopRecording() {
    let recorder = RPScreenRecorder.shared()

    recorder.stopRecording { [unowned self] (preview, error) in
        self.navigationItem.rightBarButtonItem = UIBarButtonItem(title: "Start", style: .plain, target: self, action: #selector(self.startRecording))

        if let unwrappedPreview = preview {
            unwrappedPreview.previewControllerDelegate = self
            self.present(unwrappedPreview, animated: true)
        }
    }
}

func previewControllerDidFinish(_ previewController: RPPreviewViewController) {
    dismiss(animated: true)
}

override var shouldAutorotate: Bool {
    return true
}

override var supportedInterfaceOrientations: UIInterfaceOrientationMask {
    if UIDevice.current.userInterfaceIdiom == .phone {
        return .allButUpsideDown
    } else {
        return .all
    }
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Release any cached data, images, etc that aren't in use.
}

override var prefersStatusBarHidden: Bool {
    return true
}
}