Simple as new virtual server, not touched. Had this happen in the past as well. When I attempt to run the Quick Install of RDS I get "unable to create the session collection" on the Session Collection stage. Then when I go to add roles or features the "session-based desktop deployment" option is greyed out.
Clearly this is broken, and has been for a long time.
Why in FUCK hasn't this been fixed?
Why in FUCK are Microsoft talking Windows 10 and new Server version when shit like this isn't fixed?