Island Paradise on Sim 3 world Missing.

@jelly_pickle959  It's possible that you registered your IP code to another account.  It's also possible that EA made a mistake somewhere along the line.  Regardless, the only way to resolve this is to contact EA customer support.  Only EA can actually look at your account and possibly fix the discrepancy, but it would probably take a call or realtime chat.  Be sure to have any proof of purchase or ownership you can find on hand—the disc, its case and insert, a receipt, etc.—to show the person on the other end of the conversation.

Just a note, if you originally installed through disc, entering the code during the install process wouldn't have caused the pack to be registered to your account.  So it's possible to have the entire game installed without EA having a record of it.