my preorder code for PS4 says invalid or already useed when I try to use it

[repoe]

do you currently play ARR on PS4?
where did you purchase the PS4 Pre-Order? PSN/SE Online/Retail-online Store
did you receive a 18 Digit/12/10/etc Code?
where are you inputting the code? Pre-order site? PSN?
Do not Confuse Zero's with "O's"