notification_fail.cs

var toast = ToastContentFactory.CreateToastText02();
var item = x.First();

toast.TextHeading.Text = item.Subject.Type;
toast.TextBodyWrap.Text = "DO IT";
toast.Lang = "en_US";
toast.BaseUri = "http://google.com";
toast.Duration = BoxKite.Notifications.ToastDuration.Long;
toast.StrictValidation = false;

ToastNotificationManager.CreateToastNotifier().Show(new ToastNotification(toast.GetXml()));

You can use the Event Log to check for errors when your toast notification does not display. Look for events involving your toast notification in the Event Viewer under Applications and Services Logs > Microsoft > Windows > Immersive-Shell > Microsoft-Windows-TWinUI > Operational.

Anything there that might help?