Hi @Mary_Yvette - I'm pretty sure that together mode is included in all Teams licenses (someone correct me if I'm wrong).


However, there are some other requirements - 

As for guests, they can see together mode, as long as there are 4 people from the same tenant in the meeting already. 


Also, if anyone is using a web browser (typically a guest) to join the meeting instead of the Teams app, then they won't see together mode - yet (see this article for details: Teams Web Meetings Update Delivers Gallery View and Together Mode Features - Petri)

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