Microsoft Mesh is generally available

Microsoft announce that Microsoft Mesh is now generally available, allowing you to join a Teams meeting as an Avatar within a 3D space. Features are available to everyone licensed with a Microsoft 365 Business Basic/Standard/Premium, Microsoft 365 E3/E5 or Office 365 E1/E3/E5 licence, with the creation of customised 3D spaces requiring a Teams Premium licence. Find the announcement here:

External user licensing requirements for Teams

Microsoft update the Product Terms site for May 1, 2021 by confirming that User SLs are not required for any user to join a Teams meeting or a Teams Live event. User SLs are also not required for external users to participate in Teams channels as a Guest with an Azure AD External Identity: