UWP crashing when changing from XAML to D3D in Unity3D

I am trying to call from a XAML to a D3D code compiled in Unity for HoloLens device. For that I try to follow instructions of this post.

• I have compiled the Unity Project in version Unity2017.2.f03 in XAML with selection of Mixed Reality ( Virtual reality supported)
• I have added my XAML in App.cs. So for doing this instead of calling MainPage I call Myown XAML Page for doing stuff.

private void InitializeUnity(string args)
        {

 if UNITY_WP_8_1 || UNITY_UWP
            ApplicationView.GetForCurrentView().SuppressSystemOverlays = true;
     endif

     if UNITY_WP_8_1
                StatusBar.GetForCurrentView().HideAsync();
     endif


                appCallbacks.SetAppArguments(args);
                Frame rootFrame = Window.Current.Content as Frame;

                // Do not repeat app initialization when the Window already has content,
                // just ensure that the window is active
                if (rootFrame == null && !appCallbacks.IsInitialized())
                {
                    rootFrame = new Frame();
                    Window.Current.Content = rootFrame;
    if !UNITY_HOLOGRAPHIC
                 //  Diego commented this line and discommented
                    Window.Current.Activate();
    endif
                  //  rootFrame.Navigate(typeof(MainPage));
                    //**Here is where I update my code**
                    //**Here is where I update my code**
                     //**Here is where I update my code**
                    rootFrame.Navigate(typeof(MyOwnPage));
                }

                Window.Current.Activate();
            }`

In Myown page when I finish my things to do there, I try to call Unity3D so I use the functions suggested in the blog.

 private async Task CreateNewHoloWindowAsync()
        {
            try
            {
                var appViewId = MainAppViewId = ApplicationView.GetForCurrentView().Id;

                var _newCoreAppView = CoreApplication.CreateNewView();

                await _newCoreAppView.Dispatcher
                    .RunAsync(CoreDispatcherPriority.Low,
                  async () =>
                  {
                      var frame = new Frame();
                      Window.Current.Content = frame;
                      frame.Navigate(typeof(MainPage));

                      _newCoreAppView.CoreWindow.Activated += WindowActivated;

                      _newCoreAppView.CoreWindow.Activate();


                      var res = await ApplicationViewSwitcher.TryShowAsStandaloneAsync(
                          ApplicationView.GetForCurrentView().Id,
                          ViewSizePreference.Default, appViewId,
                          ViewSizePreference.Default);

                      _newCoreAppView.CoreWindow.Activated += WindowActivated;

                      _newCoreAppView.CoreWindow.Activate();
                  });
            }
            catch (Exception ex)
            {

                var dialog = new MessageDialog(ex.Message);
                await dialog.ShowAsync();
            }
        }

        private void WindowActivated(object sender, WindowActivatedEventArgs e)
        {
            try
            {
                if (e.WindowActivationState == CoreWindowActivationState.CodeActivated
                    || e.WindowActivationState == CoreWindowActivationState.PointerActivated)
                {
                    AppCallbacks.Instance.SetInitialViewActive();
                    // Only need to mark initial activation once so unregister ourself
                    CoreWindow coreWindowSender = sender as CoreWindow;
                    coreWindowSender.Activated -= WindowActivated;

                }
            }
            catch (Exception ex)
            {

                var dialog = new MessageDialog(ex.Message);
                dialog.ShowAsync();


            }
        }

Everythings seems to go well, but when the Unity d3d compiled code starts in a new window it suddenly crashes with exception : -2147483645 (0x80000003). There is no more information available. I think I am missing some code with the callbacks but I have no such experience in UWP. Some code that can help me?