#Yammer (oh sorry I meant "Viva Engage communities") will be enabled in #Teams for everyone, by default. Unless if you opt out at org level: https://mc.merill.net/message/MC1218423Here's how you can turn this thing off: https://learn.microsoft.com/en-us/MicrosoftTeams/teams-viva-experiences#how-to-set-viva-engage-experiences-in-teams
