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 start a group conversation with people in your distribution list, Microsoft 365 group, or mail-enabled security group. The group can have up to 250 members.

Go to your list of chats and channels, and select New message .
Next to To, type an existing group name.
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:

Admins can disable Chat with Groups in the Teams admin center.
Dynamic distribution groups aren't supported.
Adding a distribution group and expanding it in an existing chat is not currently supported.