Here's the current information from the AP website. However, from past experience (been an AP holder since 1995), the AP holder does not have to be the one making the reservation, but does need to be staying in the room.
"No group rates or other discounts apply. Advance reservations required. Passholder must present his or her valid adult Pass at check in. Offer will also be made available to certain non-Passholders in other select promotions."