So, I've been playing just fine, it's been a week or so though due to RL. I just logged in and it's asking for a registration code. When I input the code it says it's already used...not sure what to do =(

I clicked to skip for now..but should it be asking for another? If so, I only have the one I used when I pre-ordered the expansion. That and the pre-order item code. Both of which says already used.