I assume it's CFU, not CRF - the itinerary looks OK. You would be doing two transits and one stop in Tokyo so that should be OK. So long as the transit OKA-HND-SYD is less than 24 hours it should be compliant with the rules. So that looks like either a married sector issue or a problem with the agent.
The only other possibility is an issue with flight classes - from memory JL's business class domestic offering (Class J) does not sit neatly within the normal system and you might need to take Y.
Below is the J Class flight I am trying to add to my existing OWA booking as explained earlier. I have spoken to 3 separate CSR's from the Fiji call centre and none have been able to assist, stating that JL won't allow it. I am at a loss to explain why this is happening other than it's too complicated and the CSR's in Fiji, too inexperienced. I am on the verge of giving up, however it is extremely frustrating to have to pay for a segment that is available to be booked under the rules of the reward.