When I purchased, I did not get the 6-3-6-3 code in my email, either. They, however, emailed me a few days later.

"FINAL FANTASY XIV: A Realm Reborn Pre-Order Bonus Code

It has come to our attention that you recently ordered FINAL FANTASY XIV: A Realm Reborn from the Square Enix Online Store, but did not receive your pre-order bonus code."

And provided me with the two codes I was owed. So, it's not really an NA/EU thing so much as some of the receipt emails were screwed up. Try contacting SE about it?