Many people are reserving, and hoping for a code, but will drop the ressie as the date approaches. Keep trying.
Even in October CR is only showing availability for theme park view and above...no wing rooms or bay lake view rooms!! Seems so early to be booked up!
The CR is a convention hotel, so quite often they will hold large blocks of rooms for the conventions booked there. As it gets closer to the actual event, the rooms that are not spoken for will be released to the public. So keep trying -- I hope you get what you want!