You can delete a user-defined user group for OneDrive for Business. You cannot delete the default user group.
Important
When you delete a user-defined user group, if jobs are scheduled to run on that user group, then those jobs are deleted.
Procedure
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From the navigation pane, go to Protect > Applications > Office 365.
The Office 365 apps page appears.
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Click the OneDrive for Business app.
The app page appears.
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On the User groups tab, select the check box of a user group that you want to delete.
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Click the menu icon
, and then click Delete.The Delete subclient dialog box appears.
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Type DELETE, and then click Delete.