I have created tow minimal project to reproduce the problem.
You can download from github https://github.com/bvp898/UWP_DesktopBridge_Purchase.git
The shared code Store.cs is copied from microsoft's document.
Project Purchase_UWP is a UWP project, work fine.
Project Purchase_NetDestop is a Win32 project, converted with Desktop Bridge. It always return "The purchase did not complete. The customer may have cancelled the purchase. ExtendedError: ", the purchase dialog dose not show up.
Please help me with the problem, I need to add purchase for subscription in Win32 app.