Even if you select ‘Use Points’ on the Qantas website,
non-oneworld partners can show up. Those airlines (such as Emirates and Jetstar) can’t be used in a Oneworld Classic Flight Reward. The pricing won’t work.
Check the eligible member airlines here
Also, have you checked if the itinerary is under 35,000 miles? You can use the Great Circle Mapper and the airport codes to check.
EDIT: Also looks like you have six stopovers instead of the allowed five.
You need to include the transiting ports in the distance calculator too if you haven’t already. A lot of the flights aren’t direct hence I see it may exceed 35000 miles depending on the airline/transit ports.
You will need to include Athens to Olso too despite not being on the itinerary.