Fix setting property

Microsoft.Toolkit.Uwp.Notifications/Toasts/Compat/ToastNotificationManagerCompat.cs

@@ -506,7 +506,7 @@ namespace Microsoft.Toolkit.Uwp.Notifications
             }
         }
 
-        internal static void PrepForScheduledToast()
+        internal static void PreRegisterIdentityLessApp()
         {
             // For plain Win32 apps, we first have to have send a toast notification once before using scheduled toasts.
             if (!_hasSentNotification && !DesktopBridgeHelpers.HasIdentity())

Microsoft.Toolkit.Uwp.Notifications/Toasts/Compat/ToastNotifierCompat.cs

@@ -58,7 +58,7 @@ namespace Microsoft.Toolkit.Uwp.Notifications
         public void AddToSchedule(ScheduledToastNotification scheduledToast)
         {
 #if WIN32
-            ToastNotificationManagerCompat.PrepForScheduledToast();
+            ToastNotificationManagerCompat.PreRegisterIdentityLessApp();
 
             PreprocessScheduledToast(scheduledToast);
 #endif
@@ -125,7 +125,16 @@ namespace Microsoft.Toolkit.Uwp.Notifications
         /// </summary>
         public NotificationSetting Setting
         {
-            get => _notifier.Setting;
+            get
+            {
+#if WIN32
+                // Just like scheduled notifications, apps need to have sent a notification
+                // before checking the setting value works
+                ToastNotificationManagerCompat.PreRegisterIdentityLessApp();
+#endif
+
+                return _notifier.Setting;
+            }
         }
 
 #if WIN32

Microsoft.Toolkit.Win32.WpfCore.SampleApp/MainWindow.xaml.cs

@@ -30,6 +30,12 @@ namespace Microsoft.Toolkit.Win32.WpfCore.SampleApp
 
         private async void ButtonPopToast_Click(object sender, RoutedEventArgs e)
         {
+            if (ToastNotificationManagerCompat.CreateToastNotifier().Setting != NotificationSetting.Enabled)
+            {
+                MessageBox.Show("Notifications are disabled from the system settings.");
+                return;
+            }
+
             string title = "Andrew sent you a picture";
             string content = "Check this out, The Enchantments!";
             string image = "https://picsum.photos/364/202?image=883";