Sims 4 Get together expansion help

@Messed_Up_Sims  Was the case open when you bought it? Was the game sold as used (I don't think so)? Argos is NOT on the EA authorized reseller list so it may be possible that Argos is getting the games from an unauthorized distributor. EA is blacklisting codes that violate the TOS (terms of service).  Did you enter the code more then once?  The EA system will only accept the code once. If the code is blacklisted you need to contact Argos for a refund or other resolution.