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I would just wait personally, until they say it is functional again. I however got it to register about an hour ago first try. I put the code in, got error 3, clicked refresh while it said error 3, went from the refreshed screen to my profile and it said FFXIV: ARR was registered. However i have not received my 20 code after that and even if I do it has a chance of being the EU one which would be useless anyways. So I would just wait personally but since it went through I really have no choice anymore even if I do end up with an EU one (if any at all gets sent.. still waiting.)