I had a friend who had preordered prior to the phase 4 open beta and he was entering his code for early access at the same time I was and he got in first try no issues. My code purchased now 5 hours ago still isn't working been trying pretty much nonstop. There is no official news on this error since the Wrong region codes were going out. I though don't see this as being an issue that would cause the game to flop, it will definitely pissing a lot of people but it isn't as game breaking as a terrible inventory, or laggy UI from 1.0