I flew KUL-HKG, CX on MH metal last year (L or V I can't remember). At check-in I was guided to MH desk on basis that this was MH operated. They refused to enter the MP card details. I didn't raise a fuss at the time and filled in the standard claim form on the website. This was rejected automatically. I then replied in detail via email explaining why this was a qualifying flight. Got the credit (incl MPC) a few weeks later.