OpenUrlContexts in SceneDelegate not called when URL clicked on

I have a deep link registered, and where iOS is 13 or greater, although clicking on the link opens the app, the OpenUrlContexts override does not fire, hence I am unable to filter then navigate, based upon the URL.

This is a Xamarin Forms app, however I've asked the question here in the iOS forum, because it involves the new iOS Version 13+ SceneDelegate with modified AppDelegate.

I've included the following code files:
1. SceneDelegate
2. AppDelegate
3. apple-app-site-association
4. Entitlements.plist
5. Info.plist extract
6. App.xaml.cs

Does anyone know why the OpenUrlContexts method is not being called?

SceneDelegate file

    [Register("SceneDelegate")]
    public class SceneDelegate : UIWindowSceneDelegate
    {
        [Export("scene:openURLContexts:")]
        public override void OpenUrlContexts(UIScene scene, NSSet<UIOpenUrlContext> urlContexts)
        {
            Debug.WriteLine("*** URL property =====" + urlContexts.AnyObject.Url);
            var urlString = urlContexts.AnyObject.Url;
            if (urlString.Equals("https://REDACTED"))
            {
                // Run code 
            }
        }


        public override UIWindow Window { get; set; }

        public override void WillConnect(UIScene scene, UISceneSession session, UISceneConnectionOptions connectionOptions)
        {
            var windowScene = scene as UIWindowScene;
            if (windowScene != null)
            {
                Window = new UIWindow(windowScene.CoordinateSpace.Bounds);
                if (Window != null)
                {
                    // This just creates a new App instance without creating a new AppDelegate
                    // In iether case I still see issues with navigation events going to the wrong window,
                    // i.e. I tap Add Item in one window, but the new item page launches in another window
                    // Or use the menu to go to the ABout page, and the About page opens in the other window
                    // This is in keeping with what I have seen in reagrds to embedding forms pages into native 
                    // projects. In this case, you need to use the platforms navigation APIs, not Xamarin.Forms
                    // navigation APIs
                    var fApp = new App();
                    try
                    {
                        // Set the scene's RootViewController from the one X.Forms created
                        Window.RootViewController = fApp.MainPage.CreateViewController();


                        //// This creates the Xamarin.Forms UI with a new app delegate
                        var ad = new AppDelegate();
                        ad.GetUI();
                        //
                        //// Set the scene's RootViewController from the one X.Forms created
                        Window.RootViewController = ad.Window.RootViewController;


                        // Set the WindowScene
                        Window.WindowScene = windowScene;
                    }
                    catch(Exception ex)
                    {

                    }


                }
            }
        }
    }

AppDelegate file

    [Register("AppDelegate")]
    public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate
    {
        public UIApplication application;
        public NSDictionary options;
        //
        // This method is invoked when the application has loaded and is ready to run. In this 
        // method you should instantiate the window, load the UI into it and then make the window
        // visible.
        //
        // You have 17 seconds to return from this method, or iOS will terminate your application.
        //
        [Export("application:didFinishLaunchingWithOptions:")]
        public override bool FinishedLaunching(UIApplication app, NSDictionary options)
        {
            global::Xamarin.Forms.Forms.Init();

            if (UIDevice.CurrentDevice.CheckSystemVersion(13, 0))
            {
                // only used when creating a new app delegate in the scene delegate in order to be able to call 
                // LoadApplication in GetUI method
                this.application = app;
                this.options = options;

                return true;
            }
            else
            {
                LoadApplication(new App());
                return base.FinishedLaunching(app, options);
            }
        }

        // only used when creating a new app delegate in the scene delegate
        public void GetUI()
        {
            LoadApplication(new App());

            // This call populates the Window property so it needs to be called after LoadApplication for every scene 
            base.FinishedLaunching(application, options);

        }
    }

apple-app-site-association file:

{
   "applinks": {
     "apps": [],
     "details": [
       {
         "appID": "REDACTED",
         "paths": [ "/", "/REDACTED/*"]
       }
     ]
   }
}

Entitlements.plist file

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <key>com.apple.developer.associated-domains</key>
    <array>
        <string>applinks:REDACTED</string>
    </array>
</dict>
</plist>

Registration of SceneDelegate in info.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
    <!-- other stuff not shown here -->
    <key>UIApplicationSceneManifest</key>
    <dict>
        <key>UIApplicationSupportsMultipleScenes</key>
        <true/>
        <key>UISceneConfigurations</key>
        <dict>
            <key>UIWindowSceneSessionRoleApplication</key>
            <array>
                <dict>
                    <key>UISceneConfigurationName</key>
                    <string>Default Configuration</string>
                    <key>UISceneDelegateClassName</key>
                    <string>SceneDelegate</string>
                    <key>UISceneStoryboardFile</key>
                    <string>EmptyStoryboard</string>
                </dict>
            </array>
        </dict>
    </dict>
</dict>

Xamarin.Forms App.xaml.cs

    public partial class App : Application
    {

        public App()
        {
            InitializeComponent();

            DependencyService.Register<MockDataStore>();
            MainPage = new MainPage();
        }

        protected override void OnStart()
        {
        }

        protected override void OnSleep()
        {
        }

        protected override void OnResume()
        {
        }

        protected override void OnAppLinkRequestReceived(Uri uri)
        {
        // DOES NOT FIRE EITHER
            base.OnAppLinkRequestReceived(uri);
        }
    }