How to send HQPlayer upsampled signals from heavy PC to lightweight headless NUC for playback

Apologies for reviving an old thread - would it be possible to give more details on this?
I have loaded the dll and also the NAA software on my endpoint - a Windows 10 mini pc.
I can select everything in HQP and also set up the HQP endpoint in Roon,
On the mini pc I can see the SignatAnalyst NAA open (terminal) and when I make selections in HQP on the main PC I can see settings updates being made in the minipc terminal.

However Roon will not play.
I assumed I had to have the NAA software open on the minipc, but is there anything else I need to do? HQP does find my DAC, but error message on Roon says can’t find HQP.