Peut être une piste que je colle ici:
Problem solved with the help of a significant amount of luck
Posting here what I did to resolve this weird problem in case anyone else run into it:
When I entered "Security and Maintenance" (search from Start menu) that window opened up with the Maintenance section expanded, it contained a device driver warning with a "update" button, it is worth mentioning that no such warning appeared in Device Manager.
After clicking this button the message immediately disappeared with no special indication.
Then I clicked the blue "Start maintenance" label under that section which triggered a maintenance run lasting few minutes.
After that, all of a sudden, I could find the “HP Reverb VR Headset Setup” app under the start menu, and ran the manual pairing process successfully.
My guess is that Window had some weird problem installing the drivers, plus it took a maintenance run to cause the “HP Reverb VR Headset Setup” app to appear.
Hope that would help others.
CPU: ryzen 3600 / corsair hydro h115i Platinum / CM: aorus x570 elite / CG: rtx2080 OC aorus / RAM: 32G DDR4 3200 / SSD Crucial MX500 / Alim: corsair RM750X / VR: HP Reverb / Volant: ts pc racer / Hotas: warthog / Palonier: thrustmaster TFRP / Cockpit: GT Omega pro