I would ask your friend to go to a notaria in Chile AND Argentina.
He will need your pasport number and full name, it will cost a few pesos and maybe 40min. waiting in each notaria. They might also ask for a copy of all important pages of your passport. If I do so with my chilean ID they ALWAYS want a copy and they always want it "ambos lados", both sides.
Use the arg. poder on the arg. side and the chilean on the chilean side.
Groschi
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