Have booked online AKL/BNE return in March. Booked Works in Space+, 747 outwards, 777 return.

As usual, visit regularly to review seating and bookings in case anything better occurs. Today am unable to review seating on return flight. It tells me I cannot do this until I get to the airport.

Does anyone have any idea what may be happening? Am particularly interested in this leg as I may want to upgrade to WD and would need to know seating available before doing this.