My TA had the same problem on Friday. The publishing carrier may have tinkered with it as of Friday .Now over the water it seems has to be on publishing carrier metal.I have not tried ticketing it via SYD;it should price over SYD, as long as the carrier continues to file this fare via SYD should hold as it fits into the MPM+25%.

My TA booked and ticketed early July via AKL .Tried on Friday for Business Associate would not price.Book identical Itinerary which she ticketed early July, the one on Friday would not price at the same price. Way higher.
Tried via Vancouver as well;no luck.
I expected the route to have a month self life, until early August.Which is why I suggested to my Business Associate to book & ticket it ASAP.
That particular carrier tinkers with fare filing once a month in a given week of the month.
I was surprised my TA could not ticket it on Friday. She is going to try again on Monday.Maybe a Glitch.Will know on Monday.