Note: The POS should be set to where your DONE ticket was issued, so that would be OSL, rather than USA. This is potentially the issue if there is only D2, it can vary by POS.

However, to be clear since you mentioned JL - I've had a lot of problems with this recently as well on AONEs, they seem to have worked out some way to block AA RTW tickets (admittedly I was looking for A class space, but only for a single person). For example recently I tried to do a JL first flight (A class) from HND, so was willing to do one of ~10 destinations that offer the cabin with +/- one week of availability without any joy at all even though ExpertFlyer always showed some spaces. Some agents suggested waiting till closer to the flight time and trying again, though in another experience that did nothing apart from restrict my other options further, as such I would not be looking for JAL and instead consider alternative airlines. And I was checking the JAL website and they were willing to sell in their own A class, and since my tickets are all ex-Japan, it shouldn't be a POS issue as much, since they presumably wouldn't be blocking their home market from tickets.

There are more details here, as unfortunately you may be being affected by this problem (has been raised to expertflyer, no fix yet - feel free to raise a support ticket as the more complaints they get the more likely it is they properly investigate):
AA RTW desk availability compared to Expertflyer and OW online booking tool