Calibrartion says that it works fine but is followed by a "demo" where you are told to "focus on anyot to see if you can light it up". I can but only if I look a fair bit (-20 deg) below the dot. This is as described in the other post I linked. I am currently in the process of installing the Tobii SDK to see if the tracking is in fact OK with a different demos (as the other post suggests).
I am using SteamVR 1.8.20