When I attended back in May, the CMs on the phone could not apply the AP discount prior to attending. One even wanted to cancel it day of, and "see if they could re-book me." I spoke with someone when I checked in, they took my information down, and told me I would get a credit. Never happened.
I had to keep calling, but after persistence finally got the credit! I would advise on also trying to have it applied prior to save yourselves some stress.
Maybe TIW will be different? My CRT and Spirit of Aloha worked fine, and I saw the credits within 3 - 5 days.