[Mashiro]

Are you receiving video output to your screen from the server already over that GPU or over the onboard graphics?

Have you checked the device manager and what it says in terms of graphics adapter? I assume its most likely going to say basic video adapter by Microsoft or something similar.

Download the latest drivers for your Geforce GTX 1080 Ti from Nvidia and install them (without Geforce Experience). The current driver is available at https://www.nvidia.com/en-us/drivers/results/170312/ (Game Ready - WHQL).