20-Digit Early Access Code

[Victros]

When I log in to the game client, it says "No valid or active service account is available to play FINAL FANTASY XIV: A Realm Reborn." It gives me a link to enter a code..."Proper registration through the FINAL FANTASY XIV: Mog Station is required." When I click the link, the only option I see available is to "Add Platform." When I click on this, it wants a 5-part, 20-digit code. All I have is a 4-part, 18-digit product code.

Any ideas? I'd love to play, but I'm stuck. Thank you!