Would be region locked.
I live for more then 14 years at Argentine but my steam account is from Belgium where i'm from, so don't kill me if there would be a problem with the region lock.

⚠️ Region lock ⚠️

Hero's Hour - gift link notification (US); gift link notification (EU)

China: likely {sub/678795}
SEA (incl. Taiwan): likely {sub/678794}
Turkey: likely {sub/678793}
LATAM: likely {sub/678796}
RU/CIS: likely {sub/612635}
Europe: {sub/678798} (confirmed)
Everyone else: {sub/678797} it is NOT a ROW key; it cannot be activated in China + Turkey + Europe + LATAM + SEA + RU/CIS (US confirmed)