@Rich_Graham I investigated this a bit further, and at least on my PC the following happens:
If I have SteamVR running first with an active controller, then add the livelink source, I receive no input.
If I, however, start the livelink source first, then start SteamVR, I get input information. I’ve recorded a video that shows this:
I have no clue how and why that happens, and if it is just on my end… The same occurs when using an actual headset connected.