In Outlook on the web, click the settings gear (upper right corner)
In the search box start typing distribution and select Distribution groups (also under General > Distribution Groups)
Click the link to open the distribution list portal
Select ‘Groups I own’ and Double click the group you own and would like to edit. You can also search for a group if you own multiple groups to find the group easier.
You can add/remove users under membership, you can also edit the managers under ownership
Select Default Global Address List, enter user’s name, click + sign next to their name then click Save
Select ‘Members’ then click ‘View all and manage members’
Select ‘Add members’
Search for the user then select the radio button next to their name and click ‘Add’ at the bottom of the flyout
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