Monzo isn't recognized in Argentina

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It should work anywhere that Mastercard is accepted.

There’s a recent post here

Using Monzo card in Argentina

Hello from Argentina, want to share my experience. I have found plenty of places to change your dollars to pesos, so far I have change 2 x 100 USD note. When you approach the black market cambio person, make you he offers the correct blue exchange rate , you can check on here first Blue Dollar Rates : Dólar Blue Informal Rate of US Dollar in Argentina | Blue Dollar Rates . My monzo has been accepted in most places including smaller shops and cafes. They are using the MEP rate which is just ver…