There's one more issue at play that you can't account for without a GDS, even if your POS is correct there's a POO (Point of Origin) as well that comes into play with RTW tickets. There have been a few people with GDS terminals in the pricing thread you might reach out to to check availability with the correct POO. Sounds likely the problem. But JL is terribly tight on D availability at least for the next couple of weeks, I reckon because a lot of Obon holiday period travel ex-Japan during August.