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You can begin a group conversation with those in an existing distribution list, Microsoft 365 group, or mail-enabled security group with a maximum of 250 participants. 

  1. Go to the chat list, and select New Chat New chat icon in Teams.

  2. Type an existing group name into the To: field. 

  3. Select from a distribution list, M365 group, or mail-security group to add new chat members to the existing group chat in Microsoft Teams.


  • Admin controls to disable this feature are coming soon.

  • Dynamic distribution groups are not supported.

  • Adding a distribution group and expanding it in an existing chat is not currently supported.

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