You can claim ownership of Active Directory groups if they do not have an owner.
If you claim ownership for a group, you are accountable for the interests of that group. For example, you decide about memberships within your group.
To claim ownership of a group
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In the menu bar, click Responsibilities > Ownerships.
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On the Ownerships page, click Claim Ownership.
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On the Claim Ownership page, click Assign.
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In the Select a group dialog box, click the Active Directory group for which you want to claim ownership.
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On the Claim Ownership page, click Claim Ownership.