I bought World Adventures on sale around Christmas. Got it through Origin, but it didn't automatically register with my Sims 3 account. I've tried several times since then to get the code to manually enter, but to no avail. I did the troubleshooting suggested to replace some of the characters in the code and that didn't work either. None of the other expansions I own have given me problems, so help would be appreciated.
This seems to be a confusing issue for many people. Please read either of these helpful posts to make sure you've followed the right steps:
-- http://forum.thesims3.com/jforum/posts/list/656133.page
-- http://forum.thesims3.com/jforum/posts/list/655809.page
Though this advice is geared to redeeming University Life, it's applicable to the EPs like World Adventures. If you're still having issues after that then you should contact EA here-- https://help.ea.com/contact-us. Only they can help with account issues. However, most of these issues can be resolved by reading these clear instructions posted above.
Best of luck
