I managed to send Toast messages but once clicked, the callback is not invoked. This is the

CodePudding user response：

Just on the name alone it seems to me like you need to set the PKEY_AppUserModel_ToastActivatorCLSID property on the .lnk and not just the AUMID.

MSDN says:

Used to CoCreate an INotificationActivationCallback interface to notify about toast activations.

This page is marked as pre-release but does have a different InstallShortcut function that sets this property.