I ran across an issue working on my MDT/WDS Windows 10 Deployment. I'm using the Microsoft Guide https://bit.ly/2nGwz8l, and I found that I could use the 64 bit wim in WDS to boot my physical machines, but it would fail after the PXE load on my Hyper-V machines. I would get the blue windows logo but that was all.
so on a hunch, I loaded the x86 wim to WDS and tried that and it worked just fine.
Has anyone else run into this? We don't use any x86 machines any more, so I was hoping to just depoly everything in x64. I guess it isn't a big deal as the WDS/PXE wim is just getting the system loaded, the image itself that I'm dropping on the machines is x64.