Using multiple SteamVR controllers with LiveLinkXR

Hey all! I’m currently working on a short film where we’re looking to do both virtual production and very basic realtime motion capture of for two actors’ hands. I was hoping to use bog-standard Valve Index controllers, alongside an HTC Vive Tracker for the camera.

While I’ve managed to get four controllers connected to SteamVR, I can’t seem to get the transforms to show up in Live Link; instead, I only see a /user/hand/left and a /user/hand/right transform.

Is there something I need to configure in Live Link to make this setup work?