Just had the same problem with an AA award redemption on QR. Was only resolved by having AA remove my AAdvantage number from the reservation.
Only then could I access QR site manage my booking. And there was a totally different FF # in my QR booking. Not AAdvantage and not Privilege Club. 🤔
It did make the booking disappear from my AA account, but I could still access with AA PNR. But it did give me full access to QR manage my booking.
must be some sort of glitch with award bookings.