Originally Posted by
JapanFlyerT
Perhaps it works for because you used the same email/pwds?
I set up Amz USA and Amz JPN with different emails/street addresses/payments etc. They are quite different accounts.
I don't know how it happened, but the login was accepted universally without having to re-register, my addresses are synced up on all the sites, same payment (Amazon visa card) and I can switch between all the prime video countries when I want to watch different videos.
When I use the app and want to buy and ship to a different country it asks me to confirm to switch countries.