Dell EMC R6515 with Nvidia A2 remote desktop 3d view initialization failed

I have an interesting issue in which I would like to get some assistance.

Background:

Server im using: Dell EMC R6515 with Nvidia A2 included

Windows remote desktop usage

Optitrack Motive application – GPU is needed ( see attached picture)
3d view initalization failed

Remote desktop was set up based on this manual:

Based on this forum topic I probably need to buy a licence:

BUT, Im unable to choose A2 here:
https://enterpriseproductregistration.nvidia.com/?LicType=EVAL&ProductFamily=vGPU&ncid=em-news-525732

Could you please help to figure out what am i missing here?