Sometimes the flights do show as available on single routes but if you try and connect them the award seats disappear. Apparently this is due to KLM allocating only a certain number of seats to certain routes. In the old system it was possible to reserve as two separate bookings, albeit you paid some extra airport taxes but in the new system it would cost a lot more miles as the connecting segment to AMS is effectively free if it is on the same reservation.

It would seem that there is no way to bypass this in the helpdesk reservations computers and equally not on the website but I suppose the choice is always there to spend the extra miles to get the flights that you want or to buy a flight to AMS to then connect to the onward award flight.

Nobody seems to be able to explain this strange phenomenon completely and unfortunately it would seem that we just have to live with it.