This is my exact problem as well. I put in a ticket, I hope they figure this out on the double!
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So you switched back to your main account and tried to launch the client and it said wrong region :(?
What crazy is the NA PRE-ORDER page you enter your 6-3-6-3 code is somehow defaultd to the login menu to EU members page I just tried this on safari and tried it on firefox I had cleared all history, cookies, and cache. The page is just messed up dont matter if I click the US flag or use the tab that says English US it defaults to the Eu members login. I wasnt logged in.
So now my account nick is SilverMoon90000 instead of SilverMoon9000. Arrgh.
Wrong region? still :(?
That login bug could be what started this whole mess. or maybe not. You can change the login screen to NA by adding /login?locale=na
(ex https://membership.square-enix.com/sqex/login?locale=na) at the end of the string. Not sure if its even in use though because it doesn't have a flag icon like the other ones do.
changed it to na and processed my code and got the same eu code. in fact I went to just about all other languages and tried it and i got the same code. It looks like it doesn't even try to process it, it just checks if its already been submitted and if that returns true then it just gives you the same exact code. :(
Yea so far. Trying to see if there is a way around it.