Redeemed product code for Sims 3 in EA app, but game won't appear in library

I redeemed the product code for Sims 3, which I own as a disc, but it didn't appear in my EA app library. I purchased the game before Origin was around. When I tried to repeat the process, the EA app told me that I have "already redeemed" the product code. And yet it still won't appear in my library. None of the solutions suggested on this page have worked. Please help!