How to add multiple users to a group in Office 365 admin center
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1. Go to Office 365 Admin Center
2. Hover on User icon
3. Click on "Active users"
4. Select users you want to add to any group
I am selecting first four users, for example
5. Click on "Add to group"
6. Select any group from here
Also, you can enter group name in search box
7. Click on "Save"