Windows Server 2012 Hyper-V RemoteFX Adapter not avalible

I’ve been having a problem connecting my NVIDIA K2 card to a virtual machine in Hyper-V. I followed these instructions
until it asked me to select RemoteFX 3D video adapter in the hardware settings of the virtual machine. At that point RemoteFX 3D video adapter didn’t even show up as an option.
We attempted to troubleshoot it and promote the off board graphics card as the main GPU in the bios, however that didn’t end up changing anything.
I guess my question is there something I need to download or fix that would be making the RemoteFX adapter unavailable to the VM.