Check the PCI and VEN numbers shown in Windows 10 exist in an inf file in your WinPE build and check that the 64 bit version of WinPE is the one in use. Run
FINDSTR /I /S /M xxxx *.inf
You might need to add Devcon to your WinPE build to further troubleshoot:
https://msdn.microsoft.com/en-us/library/windows/hardware/ff544707(v=vs.85).aspx