Poll the status of an asynchronous group creation. Returns status: "pending" until the group materialises, then status: "created" with the group — including the chatId used by every other endpoint.

Creation normally completes within a few seconds. If a request stays pending for more than a minute, WhatsApp most likely rejected it — create again.

Security:

• The organisationId in the URL must match the organisation your JWT was issued for — requests for a different organisation fail with 401.
• Requires CRM_ADMIN, ACCOUNT_OWNER, or CRM_BOT role; other roles receive 403.
• Groups are only supported on WHATSAPP_OFFICIAL channels whose number is an Official Business Account (OBA); ineligible numbers receive 422.