There are myriad and varied problems with the manage my booking section of the IB website. The best luck I have had was using a different carrier's site to put the info in, and then never, ever touch the reservation from the IB site. I think the QR site was best, but I also think I've only used it when I had a QR segment. It's worth trying anyway, all of the OW carriers sites in principal will pull up any OW reservation.