Hello Arturs,
I am curious, did you get it to work? I am facing the same problem now. I have debugged like you, everything looks good in the OpenXR runtime Debugger, giving XR_SUCCESS messages too, but the hand is never detected. This implementation is closed to us developers and since the documentation mentions support for the VIVE pro, I am a bit confused. I believe the company should provide a clarification to developers regarding this.
Best Regards