Microsoft recently announced that the Microsoft Graph API for Microsoft Teams live events will be terminated for commercial customers.
The reason for this is that Microsoft will be focussing on the Townhall functionality in the future. This is more or less the replacement for Live Events.

Users who still use this API have until spring 2024 at the latest to adapt the corresponding configurations. (Officially) The Teams Live Events functionality will then be switched off at the end of September 2024.

The replacement with the Townhall feature will allow new live events to be created on the meeting infrastructure in the future.

This creates a more consistent experience between large scale streaming events (like Teams live events and town halls) and the Teams meetings experience that users are familiar with. Town hall will be backed by new Microsoft Graph APIs that we expect to release in Spring 2024.

 

The next steps

Until the replacement town hall APIs are available, you won’t be able to convert your applications from Teams live events to town hall.

Microsoft therefore recommends the following:

Review your applications and inventory any applications that may call the Microsoft Graph APIs for Teams live events.

Start creating and testing town halls through the Teams client. This will help you become familiar with the new streaming experience so that you can convert your Teams live events to town hall-powered events.

Mark your calendar and keep an eye out for news about town halls and the new Microsoft Graph APIs.

When the new town hall APIs are released, Microsoft will make an announcement and you can start updating your applications to the new town hall experience.

 

You can find more information about this change at the following link:

Retirement of Teams live events API on Microsoft Graph