This new Teams app is being rolling out only to the new Teams client.
With this new app, end-users a central management place for their meetings.
It helps finding all upcoming meetings and their related content – like files or recordings.
To access the Meet app, open the view more apps (the ellipsis) and search for Meet
Teams administrator can also use Setup policies from the Teams administration portal to add the Meet application as pinned
When end-users access the Meet app, they will find all their meetings (recent and incoming) and their associated content