After waited around 13hrs, AM did call back and asked the credit card info., and my redeem ticket finally confirmed.
My journey is HKG - ZRH, direct flight returned zero availability, and I move on transit route. For outbound route, CX/AM site can let me redeem HKG - MAD - ZRH instantly without any problem.
But when I trying to search inbound route, CX/AM site said ZRH - MAD - HKG flight is full
But if I trying to search it sector by sector, it's able to redeem.
I only able to redeem it thru hotline (although my final plan changed to stop over at MAD, but I confirmed with CS I can able to redeem 26/Nov IB3475 + CX320).
If you looking some transit route but CX/AM web site said your flight is full, don't give up and try search it sector by sector, especially EU route.