I have been getting lots of questions over past few months about protecting an organization’s data within Microsoft Teams. These two posts were just made by Microsoft Teams and are a good introduction with additional references….
Protect your data across Microsoft Teams: https://techcommunity.microsoft.com/t5/microsoft-teams-community-blog/protect-your-data-across-microsoft-teams/ba-p/2945757
Use sensitivity labels in your Microsoft Teams: https://techcommunity.microsoft.com/t5/microsoft-teams-community-blog/use-sensitivity-labels-in-your-microsoft-teams/ba-p/2945736