Bummer.
Got my HP Reverb G2 on Christmas Eve.
Plugged it in and got an 4-1 error in the Windows mixed reality portal., which means it`s asking for SuperSpeed and the USB 3 port doesn`t give the required speed.
I`ve tried all USB ports and Type C ports on the GPU and MB to no avail.
Before I plug in the set the portal reports my PC is good to go, but when plugged in the portal report that it fails on delivering USB Superspeed.
Updated BIOS, Nvidia drivers and chipset drivers. Even bought a PCI USB 3 adapter.
So I have asked for a new cable to check if the fault lies there. If not I`ll return the set.

I see in the HP support forum that many report the same issue, and it could be a bad batch in the production.
So it`s wait and see for a while.

“We are still in the age of legends. You and I will not enter the promised land. We who have begun always perish before Jericho falls.”