I don’t think Western Union is authorized by Banco Central. At least, I cannot see it in dropdown here: https://www.bcra.gob.ar/SistemasFinancierosYdePagos/Entidades_financieras_i.aspI read that as allowing one to bring in money (via Western Union, for example, assuming it is authorized by the Banco Central, which I guess it must be), and not even necessarily then depositing it in a bank account.