To react quickly to special requests, you can assign groups directly to user accounts. You cannot directly assign groups that have the Only use in IT Shop option set.
If you assign owners and subscribers to an Office 365 group, the user accounts are also added as members to the Office 365 group.
NOTE: User accounts cannot be manually added to dynamic Office 365 groups.
To assign user accounts directly to a group
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In the Manager, select the Azure Active Directory > Office 365 groups category.
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Select the Office 365 group in the result list.
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Select the Assign members task.
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In the Add assignments pane, assign the user accounts.
TIP: In the Remove assignments pane, you can remove assigned user accounts.
To remove an assignment
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Select the user account and double-click
.
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- Save the changes.
Editing 
in the result list.