Germany has it apparently too. There's a button "Create group". Haven't tried it yet, though.

RT @juberti@twitter.com

Ramping up #GoogleDuo group calling to a few more regions (including 🇮🇳, 🇧🇷, and 🇲🇽); also starting to turn up on iOS in these regions. Duo group calling is powered by an all-new infrastructure, so we're double-checking everything, but metrics are looking good! #VivaLaCuatro

🐦🔗: https://twitter.com/juberti/status/1126287161509027840