Under the new system, for partner flights, when you submit a missing mileage request, it no longer shows up immediately on the missing mileage section of the latest transaction page. In fact there is no acknowledgement at all anywhere in the system that they've got it. It just goes into a black hole.

Agents on DM hotline are completely unhelpful ("submit it again" as if that will do anything different).

Does anyone know how long it takes to get from submitting to actually being acknowledged by the system these days?

I submitted some claims for QR earlier. Both had the same issue, and finally showed up in the system as "processing" a few weeks later. One of the flights then credited on the next day after that, and the other flight (same itinerary) is still processing weeks later. This is thoroughly frustrating behavior and the MPC agents on the phone simply don't care, and there is no email address at which you can even contact Cathay to ask a question.

I'll probably have the follow the HUACA route but it's frustrating to have to do that and play lottery until you find an agent who is actually helpful. I found one a few weeks ago who was very helpful at sorting out a schedule disruption issue as well as getting some redemptions confirmed but unfortunately the norm is that the agents are disinterested and don't know or care.