Unless someone else can advise something different, I would phone QF (the carrier) regarding being unable to select the seats online.Paranoid question: Is "ticketed" or "confirmed" what you want to see on your AA award booking?
I had a MCY-xSYD-ZQN booking which got cancelled (funnily enough) and I managed to sweet talk both AA and QF into allowing me to change to the direct BNE-ZQN flight. I got a refund on the SYD airport taxes which I assume is a good sign, but now is showing as ticketed, and I can't choose seats ...
At least the booking is ticketed (and you have the ticket numbers). Confirmed usually just means that a booking reference number has been created (6-digit PNR). Ticketed is the important part in order to fly.