I've noticed that quite a few RIs seem to not seem to list their 2 bedroom suites for award redemptions (at least with the online tool.) I have been more successful with calling MR and asking them to check for 2 bedroom availability.

Actually, I usually ask them to reserve a 1 bedroom suite and call the hotel to see if they will offer a 2 bedroom suite upgrade. And I have actually had pretty good results with that overall.