I searched the wiki and boards before posting but haven't been able to find a definitive answer regarding JAL partner valid routing. Y availability to/from Japan has all but dried up during the Olympics but I was able to find a ticket from SEA-NGO transiting HND and TPE. The online booking tool only allows these three connections so I called it in for assistance to add-on two more segments. I was told international partner awards are only allowed three segments and that the stopover would only be valid from HND and NGO since I would first enter the country at HND. I couldn't find mention of this anywhere, can someone point me to T&Cs or other data points regarding routing?

Confirmed ticket:
Thursday, July 30, 2020 JL67 SEA 2:15 PM NRT 4:15 PM
Friday, July 31, 2020 JL809 NRT 6:00 PM TPE 8:55 PM
Saturday, August 1, 2020 JL822 TPE 3:40 PM NGO 7:35 PM

Desired add-on:
Monday, August 3, 2020 JL200 NGO 7:50 AM HND 8:50 AM
Monday, August 3, 2020 JL557 HND 5:50 PM AKJ 7:30 PM