@Evenios - the original error you posted looks rather like UE can’t locate the Windows 10 SDK. The build system is not finding Windows.winmd, which typically is in [Program files(x86)]\Windows Kits\10\UnionMetadata (or somewhere like that). But I wonder whether the 16299 SDK has moved it exclusively to a versioned folder? Which could be a problem if that’s the only SDK you have installed.
On Xbox One you might want to make sure that your project is being categorized as a game on the Xbox. You can highlight your app in Dev Home, press the View button, and then select View details. If the App type says ‘App’, then you have limited access to system resources. Changing that to ‘Game’ will allow you to use more of the hardware. And if you end up submitting to the Windows Store, make sure your submission is marked as a game to get the same resources in a retail scenario.
Note that to take full advantage of the GPU on an Xbox One UWP title flagged as a ‘game’ you must use D3D12. But the current code in the fork runs into problems when using the D3D12RHI on Xbox. I hope we’ll have a fix for that in the future.
@Jerry.Richards - no plans to release the project source. It’s an Xbox One XDK project which creates some restrictions and also makes it less useful to the internet at large. XDK developers in particular may see (or have already seen) selected elements of the work appear in some of our developer outreach materials.