Hello There I have a Problem Witm Sims 3

Hello I have a copy of Sims 3 I bought from steam and I have it registered to the same email as my steam account but and on this ea account but when I went to download an ogre pack from the sims 3 exchange site on sims 3 community it said i wasn't registered so i tried registering again said in valid all i am wanting is to be able to make some ogres for my map