I am traveling 2 people together from LAX - KIX next June 2023, stopover 6 nights, and ticket from KIX-TPE all have my FIRST NAME, LAST NAME ON E-TICKET.Will I have problem boarding jal flight in LAX, how about passing immigration at the kIX custom. My passport has FIRST MIDDLE LAST NAME ?
How ABOUT FROM OSAKA TO TPE?

I do not have middle name on my e-ticket and Alaska airline who issue my ticket (using award miles) say if change adding middle name, has to re-issue and there is no availability. JAL reservation says it is a 50-50% chance and I have risk depends on agent, and also immigration at the osaka. It is definitely a more high risk when ck-in again at the Osaka KIX airport to TPE because japanese are definitely more strict on the reservation name matching exactly with the passport.