first of i had the same problem gave me a EU code twice for early acces the 20 digit code a few thing worker first of delete you history completely(or use incognito) and try again so it dosnt keep bringing you to the same spot. second go to your profile on square enix site where you see your games and change your language to english US or UK or wte if you have UK as language that for some reason has been default for us it will keep sending you to the eu website. if you do these thing when you enter your 18 digit code it should give you the EA code 20 digit right there on that page without waiting on the email and it should work work for me and three of my friends.
and yes NA is RAAU and EU is RAAE