Did you inquire about other resorts?
Each resort only has a certain number of rooms available for promotions and PINs. There may be resorts that, because of their current bookings, have no rooms available under a discount. There will be resorts that may have rooms in certain categories available but not all room categories. You have to be flexible when booking using a discount. For example, in 2008 I received a 40% off PIN. I wanted to book WL, but there weren't any standard view rooms available with the PIN. I had to upgrade to a woods view room and alter my arrival date by one day in order to get the discount. That worked out fine for me and I got the discount. Last year, I was traveling for a long weekend and wanted a moderate. I had a 30% PIN. I couldn't get any room at my first choice, POFQ, using the PIN. At POR, I couldn't get a standard view room using the PIN. But I was able to book a standard view room at CSR.
Just be flexible with resorts, room categories, and dates, and you should be able to find something with the PIN discount.