China: {sub/678795} (confirmed)
SEA (incl. Taiwan): {sub/678794} (confirmed)
Turkey: likely {sub/678793}
LATAM: {sub/678796} (confirmed)
RU/CIS: {sub/612635} (confirmed)
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)

https://www.steamgifts.com/discussion/llpBX/humble-bundle-march-2023-humble-choice-40-april-leaks