The plugins has their own solution, which I recommend rebuilt before trying to build (not rebuild) the engine itself. In our case the SLN of WMR is here: <UE folder>\Engine\Source\ThirdParty\WindowsMixedRealityInterop
The plugins has their own solution, which I recommend rebuilt before trying to build (not rebuild) the engine itself. In our case the SLN of WMR is here: <UE folder>\Engine\Source\ThirdParty\WindowsMixedRealityInterop