Winrt::hresult_class_not_registered when using WinRT for third party library

Development Programming & Scripting
1

Hi,

I’ve followed the WinRT in Unreal tutorial to integrate the Vungle SDK for Windows to build a Win64 game with in-game ads in Unreal Engine 4.27.
Compiling and using WinRT functions, as well as loading the VungleSDK.winmd works fine, but calling a Vungle function causes a “class not registered” error.
Is there an extra step involved, when using the WinRT in Unreal tutorial for Win64 instead of HoloLens games?

This is a cross-post from my Microsoft Forums post, see that post for used code.