I believe they can change your
AAA discount to the pin code, or at least cancel your current ressie and make a new one with the pin code.
This happened to us last December... we were booked at the Poly with the AAA rate and then my mother received a postcard... the reservation was in my name but since my mother was a guest in the room with me and my daughter, we were able to use the pin code.
Darlene