I was on the phone within 5 minutes this morning and AOA suites were sold out for our dates--it most likely isn't the TA's fault. Hopefully they gave you a variety of options for your dates. You can get two rooms at Pop for less than one suite at AOA, so you don't have to spend more for less room.
I'm sorry you didn't get it, and I hope something will open up for you soon, but it sounds like you knew that you were increasing the likelihood of fewer rooms being made available for the FD discount, and knew that having one booked didn't guarantee you FD, but you pre-booked anyway. It is exactly as many here warned; while it always stinks to be the example, by virtue of stating you know all the reasons not to pre-book, you were better aware than many that it would be a hindrance. It isn't Disney's fault that they followed the same algorithm for allocating discounts as the rest of the industry.
Again, I really hope a suite opens up for you once the madness dies down