Still unable to book the QR815, despite seeing constant 2-seat availability on BAEC/QFFFP throughout.

Half the agents can see the availability but can't book it, very similar to my original QR771 booking. Problem not alleviated by waiting to next day morning.

But I had two more Manila agents repeat me cancel and rebook will result in all held segments being dropped (#25) and one tell me OW redemptions require 3 partner airlines plus Cathay (#18) but decided to check with Ticketing who set her right (but she got stumped by the "disappearing" QR inventory).

Still trying. 17th Manila agent now...
I'm getting very good at reciting what I want now "Drop 645, add 815, keep 771, drop 8008, keep 244, 252"
"Yes this is a cancellation and reissue. Please charge me US$120 for each of the itineraries. But make sure you keep 771, 244 and 252"

P.S. 18th agent soon, notch one more agent for #25.