I have a post about this on the unity forums.
https://forum.unity.com/threads/errors-when-porting-unity-project-to-uwp-for-windows-mixed-reality.508795/#post-3322789
I have the project building in Unity and Visual Studio now, but when the app starts in Visual studio I'm seeing a black screen in the headset then my whole system freezes. The project does run in the unity editor.