You can use a group naming policy to enforce your “Teams-“ prefix requirements [1]. Or you can use a custom domain policy so the email addresses are at “@teams

You can use a group naming policy to enforce your “Teams-“ prefix requirements [1]. Or you can use a custom domain policy so the email addresses are at “@teams.company.com” [2] 1.https://docs.microsoft.com/en-us/office365/admin/create-groups/groups-naming-policy?view=o365-worldwide https://docs.microsoft.com/en-us/office365/admin/create-grou... 2. https://docs.microsoft.com/en-us/office365/admin/create-groups/choose-domain-to-create-groups https://docs.microsoft.com/en-us/office365/admin/create-grou...