Chat with members from your distribution lists, M365 groups, or mail-security groups in Microsoft Teams

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Hello,

Select a different account.

You have multiple accounts

Choose the account you want to sign in with.

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.

Go to the chat list, and select New Chat .
Type an existing group name into the To: field.
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:

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.