We're running Windows 2012 R2 as the server OS (with Nvidia GRID K1 cards) and have a Windows 10 guest OS in a Hyper-V VDI (Gen 1) but we're currently running into an issue with drivers for RemoteFX: It worked fine "out of the box" on a Windows 7 Enterprise guest, but Windows 10 is showing the video card as the default basic video adapter and the other component for RemoteFX in Device Manager named "Microsoft RemoteFX Synth3D VSC Driver" is showing "This device cannot start. (Code 10)".
EDIT: Windows 10 Pro gives the message above, Windows 10 Enterprise just gives a black screen after booting (safe mode works OK and shows the driver installed correctly, but booting normally just results in a black screen when the login screen should appear, it also never appears on the network so it seems it doesn't actually finish booting).
Does anyone know if Windows 10 should work as a guest OS in this situation or whether the drivers for it simply don't exist yet? (or that I'm missing something painfully obvious).