Toast notification in WPF: ToastNotificationManager.History throws an exception win10

With a lot of limitations, I manage to pop toast notifications in WPF thanks to instructions given below.

https://www.michaelcrump.net/pop-toast-notification-in-wpf/

Unfortunately, I didn't proceed very much with that with extending the code. I tried to get the history of the Notifications

       ToastNotificationManager.History.GetHistory();

But it keeps throwing an exception as follow:

       Element not found. (Exception from HRESULT: 0x80070490);

Can you please give me some hint?

Regards, Reza

Follow the below link and scroll right to the bottom.

https://docs.microsoft.com/en-us/windows/apps/desktop/modernize/modernize-wpf-tutorial-4

Notice the error code is the same as yours.

As it says, this is because you haven't registered a package identity for your app.

If I recall correctly, once you register an identity then you only get authority to do things with notifications your app raised.