Teams for life was enabled on mobile devices earlier this year, but now the update is coming to the desktop client as well.
Although there is no date for this roadmap item yet, a message in the message center appeared last week. This message described how an organization admin could control or restrict access to this new feature when it arrives. Take a look at the documentation on how to handle Teams sign-in in order to prepare.
Using this feature will also make changes to how the org switcher works for users. According to MessageID MC226759 in the message center, this will happen in December, and will move the switcher to a second level instead of being available right from the bar where it is today.