hotel directly cannot do it- they told me they can't do anything with points stays, but to call the Hilton desk - at work now, so can't but will do tomorrow
saw reports on reddit of them doing it - but not sure if there was a room available that was actually booked, then the points night cancelled- I could cancel my points night (the 8th night)- but I don't trust it to go back into inventory, then I would be out completely, and I have my airfare booked already,