What does "This method cannot be used by desktop callers." mean in context?

[gwynjudd]

Having followed the guide here https://docs.microsoft.com/en-us/windows/uwp/design/shell/tiles-and-notifications/send-local-toast-desktop to get notifications working, I then worked through to this page and found the note:

Important

This method cannot be used by desktop callers.

Can some elaboration be made on this? For context, I have used the document I linked to above to get notifications working (at least as proof of concept), in a desktop application (classic Win32). Having done so, I modified my code to try out creating a scheduled notification:

        // And create the toast notification
        var toast = new ScheduledToastNotification(doc, DateTimeOffset.Now.AddSeconds(10));

        // And then show it
        DesktopNotificationManagerCompat.CreateToastNotifier().AddToSchedule(toast);

To my surprise, it seems to work without issue, at least in this simple case? Is it an accident? Can it be expected to work in general?

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Document Details

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• ID: dea899e9-6fe7-a482-1d81-372d394599d9
• Version Independent ID: 48f7ccfa-84a8-bec4-a718-3a3e1add6281
• Content: ToastNotifier.AddToSchedule(ScheduledToastNotification) Method (Windows.UI.Notifications) - Windows UWP applications
• Content Source: https://cpubwin.visualstudio.com/DefaultCollection/windows-uwp/_git/winrt-api-build?path=%2fwinrt-api-build%2fwindows.ui.notifications.toastnotifier.yml&version=GBlive&_a=contents
• Product: uwp
• Technology: winrt-reference
• Git Login: mijacobs
• Microsoft Alias: mijacobs

[RandomEngy]

Scheduling notifications no longer seems to work in a regular win32 app. Tested on Windows 11 22H2, 22621.3007.