To react quickly to special requests, you can assign mail-enabled distribution groups directly to mailboxes.
To assign mail-enabled distribution groups to a mailbox
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In the Manager, select the Azure Active Directory > Mailboxes category. 
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Select a mailbox in the result list. 
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Select the Assign mail-enabled distribution list task. 
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In the Add assignments pane, assign mail-enabled distribution groups. TIP: In the Remove assignments pane, you can remove assigned mail-enabled distribution groups. To remove an assignment - 
Select the mail-enabled distribution group and double-click . 
 
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- Save the changes.
