If youre just trying now its because it is too late after the 180 day mark. Your closing in on the 90 day mark and I think Ohana needs to be booked earlier than that, because it is so popular.
But, it will be easy to find a reservation if you follow the September Cancelled Thread. I set it up to where it sent me emails when a new post was added. Thats how I got Le Cellier, i got the email and then I booked it right away!