Create a Microsoft 365 group
In the admin center, expand Groups, and then click Groups.
Select Add a group.
On the Choose a group type page, select Office 365, and select Next.
On the Basics page, type a name for the group, and, optionally, a description. Select Next.
On the Edit settings page, type a unique email address for the group, choose a privacy option and whether you want to add Microsoft Teams, and then select Next.
On the Owners choose the name of one or more people who will be designated to manage the group. Anyone who is a group owner will be able to delete email from the Group inbox. Other members won't be able to delete email from the Group inbox. Select Next.
After reviewing your settings and making any changes, select Create group.
Add members to the group
Once the group has been created, you can add members and configure additional settings.
In the admin center, refresh the page so your new group appears, and then select the name of the group that you want to add members to.
On the Members tab, select View all and manage members.
Select Add members.
Select the users you want to add, and then select Save.
Select Close three times.
The group will appear in Outlook with members assigned to it.