Chat with members from your distribution lists, M365 groups, or mail-security groups in Teams
This feature allows you to start a chat using your existing distribution list, M365 group, or a mail-enabled security group with a maximum limit of 250 members to a group chat.
To do so:
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Go to the chat list, and select New Chat
.
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Type an existing group name into the To: field.
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Select from a distribution list, M365 group, or mail-security group to add new chat members to the existing group chat in Microsoft Teams.
Notes:
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Admin controls to disable this feature are coming soon.
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Dynamic distribution groups are not supported.
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Adding a distribution group and expanding it in an existing chat is not currently supported.