Accidentally cancelled registration for a marketplace and could not restore it

Hello everyone. We’ve just opened an account on Amazon for the first time. We initially wanted to sell in Japan, but for some reason it ended up registering in North America for us.

We tried to register in Japan again but accidentally clicked “cancel registration”. Now Japan is no longer accessible in the switching between stores page. Under normal circumstances, the country buttons should be present at the switch button for registration.

Support told us that you need a different email for each country. But that doesn’t make any sense. We’ve tried registering in multiple countries in Europe, Australia, etc. Basically anywhere is possible EXCEPT for Japan as the Japan button has completely disappeared and cannot be restored.

Has anyone experienced this issue? We’d really appreciate your advice.