Last April I booked our Thanksgiving trip with AAA for Pop. I didn't do the tickets at that time because I was thinking I would order them from
Undercover Tourist. In early June they came out with a Free Dining pin that just barely overlapped with our travel dates. I called AAA and she said she'd take care of it. I just gave her the pin and she rebooked the reservation, of course you have to add on the park tickets in order to get the free dining. I didn't mind paying a few extra bucks for the tickets to save $700 on food!
I believe she said she had to create a new reservation with the pin number and then she canceled my original one. It did show up on my credit card as a $200 refund and then a new $200 charge. Silly how that works.
Hope you get free dining!