On the House(Free) game's Battlefield 3 activation error!

[luca92z]

hey I'm from Italy, I downloaded battlefield 3 taking advantage of the free "offers the company" but by entering the product code says "the product key you entered can't be used to trigger this game"

please help me

[peppedf1]

Me too, I can't play because the game tells me this message " il codice prodotto inserito non può essere utilizzato per attivare questo gioco".