For now, the hand-tracking system only works on VRChat via Quest 2 or Quest Pro in standalone mode. Notably, the studio say this doesn’t extend to the PC VR version accessible via Quest Link ...

VRChat's new "selfie expression" feature offers facial, hand, and upper body tracking for desktop users via a webcam. The feature requires a VRChat+ subscription, priced at $9.99 per month or $99. ...