No Extra Person Charge w/Award Reservation per T&C
For Award Reservations, the Bonvoy T&C state the Award Reservation covers the cost of any extra person charge:
3.2.e. When redeeming Points for an Award Redemption Stay, the Award Redemption Stay includes the cost of a single or double standard room at a Participating Property, room tax/service charge, and extra-person charges, if any.