Now the multiply option works for me, on a return segment after I have flown the outbound. $0.02 per mile.

And there seems to be no further information about a further bonus using an Emirates NBD card. The payment options drop-down has Visa, Mastercard, etc. but no separate selection for an affinity card. Maybe it would be automatic if I paid with that card, but of course I don't want to chance it. Disappointing.