Hand Tracking activation Unreal Engine

Hello, I am tying to activate hand tracking on my C++ Unreal Engine (4.26/4.27) project but it seems that the OpenXRHandTracking extension module is marked as unavailable. To be clear, the OpenXRHMD calls OnCreateSession for every loaded module, but Hand Tracking seems not to be available, thus, the classe’s specific OnCreateSession() is never called and the variable bEnableHandTracking is false.
I have enabled OpenXR, OculusOpenXR (I’m working on Quest 2), OpenXRHandTracking and OpenXRMsftHandInteraction plugins in my project.
Has anyone got a clue on how to make hand tracking work ?

Thanks,

Paco