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If (instead) you're trying to register your Sims 3 game that you bought on Steam, go to thesims3.com. The product keys work (my game and all EPs are registered there). You do have to type it - the copy/paste doesn't work properly with the form, so make sure you get all your 1's and L's correct when you.
You cannot register through Origin, though, you have to register through thesims3.com. The Origin form will not take Sims 3 keys. Once registered, though, Origin will know you have a copy of the game and let you download and play through it.