Error Code: 800d0000

Hi, i have an origin account, i have my gamertag linked, everything ive read everywhere has been done BUT i cannot access this game online. Isnt that the whole point? Please help me fast. I bought the game second hand but had a previously created account when i used to own the game before. So it should work. Also, i cant find the product code. No actual manual just an on disc one. I know im supposed to link it via product code but without it am i never going to be able to play online? I play my second hand disc of NFS Most Wanted (newer one) online seamlessly so why not this? Why is it even different in the way it is setup to play online? Please please get back to A.S.A.P.

Thanks,
HyDrOpOnIc1987 (thats my 360 gamertag)