I think they are not cross compatable I looked into this not long back when there was a sale on either origin or steam when they was 6 quid or so for the big expansions
It is a pain that retail and steam aren't comparable. I have too many of the expansions to switch over to steam, but would really like to own all of them on there
From what I have heard, valve wouldn't play ball with EA and so EA pulled all support for new EA games from valve so that people had to use origin instead and thus they also won't let you use your steam keys in origin.
It took the mic other day for me just to add crysis maximum ed. had to create pogo account and all sorts, my sims3 retail doesn't even register on origin despite me having the disk and it was made after origin needs
If you use a different email address for your Steam/Origin accoutns culd be why the codes don't work.
EA are adding games to Origin accoutns via backend. (IE: If you have a game registered to steam/sims3.com but not origin. EA will add that code to your origin account with the same email.).
If you have the steam codes, call EA support. They may be able to check the codes exist on another account. Then provide you with new codes to use in Origin.
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