Add a user or contact to a Microsoft 365 distribution group
Steps
In the Microsoft 365 admin center, select Teams and groups > Active teams and groups > Distribution list.
On the group page, select the name of the group you want to add a contact to.
On the Members tab, under Members, select View all and manage members.
On the View Members page, select Add members, and select the user or contact you want to add to the distribution group.
Select Add and close.
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