Clicking on "Details" does not show any additional info. It just proceeds with the program logic which works just fine. The thing that is missing is the shortcut. I have scoured the web and cannot find a solution nor any hints as to how to debug. The official documentation doesn't provide any debug hints in this case either.
The shortcut line is: "<shortcut online="true"><desktop/><menu submenu="IoX Launcher"/></shortcut>"