I booked an ANA flight from HND to OKA and back on Expedia. On my Expedia itinerary I can see the confirmation code, but when I try to look up the reservation on the ANA website I keep getting a "*Selected reservation cannot be confirmed.(A_RL_1A_002A)" error. It this because the reservation hasn't been finalized on the ANA side yet?

Also, this is the first Japan domestic flight I'm taking, so I'm wondering if I need my passport? I'll bring it anyway, but I'm just curious.