Please accept my friend request ASAP, so I can gift the game to you. (or feel free to add me first) (or you can even add me before winning, I don't mind random invites ^^)

Region-restricted to Argentina: please make sure your country on Steamgifts is the same as the one on Steam.
If your Steam country doesn’t match your Steamgifts country anymore, you should create a ticket to have it changed.
Just create a ticket with a title like "Country change" and attach a screenshot of your Steam account details showing your selected country.
You could upload it on postimages or imgur, then post the link in the ticket.