Shared meeting plan in Viva Insights - where is the message?

We are testing Shared meeting plan in Viva Insights https://support.microsoft.com/en-us/topic/shared-meeting-plan-in-viva-insights-30c3d08b-5761-4ff7-ba7d-32d9f00759a4#:~:text=Create%20and%20share%20a%20meeting%20plan%201%20Navigate,healthy%20meeting%20norms%20card%20and%20select%20Get%20started. . We sent and .... we waited 24 hours ... and .... no one received any message/proposal to accept. No info in documentation how it works exactly. Any experiencem recommendation? Thank you! Roman