My registration code I was sent is Invalid

The registration code I was sent for my PC version of the collectors edition of Shadowbringers says it is invalid. Please help

Make sure you enter it in the enter expansion registration page and not enter item code.

Be sure to register it on the Mogstation, not on the site added for the pre-order code. :)

Thank you!! That is weird they need to make that banner a little darker just looked like part of background