You may receive an error when you try to make changes to a security group or distribution group that is Mail Enabled on an Exchange Server.
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Exchange Server This operation can only be performed by a manager of the group Error
On Exchange Server EAC via mail-enabled Security You may receive an error when you want to delete your groups or make changes.
On Exchange Server Organization Management You may receive this error on a Security Group that is Mail-Enabled even if you are a member of it.
You don't have sufficient permissions. This operation can only be performed by a manager of the group.

Exchange Server This operation can only be performed by a manager of the group Error Solution
If you cannot delete the Mail-Enabled Security Group, you need to review the steps below.
How to Fix the Error When Deleting a Group in Exchange Server
When you want to delete the Security group that is Mail-Enabled in Exchange Server,You don't have sufficient permissions. This operation can only be performed by a manager of the group.If you encounter this error, you need to run the following command via Exchange Management Shell (EMS).
Remove-DistributionGroup <NameOfGroup> -BypassSecurityGroupManagerCheck
If you cannot change the group ownership for Mail-Enabled Security Group, you need to review the steps below.
How to Fix Error When Specifying Group Ownership in Exchange Server
If you cannot change the group ownership for Mail-Enabled Security Group, you need to review the steps below.
Set-DistributionGroup -Identity "GrupAdi" -ManagedBy "[email protected]" -BypassSecurityGroupManagerCheck
Owner Assignment with Active Directory Users and Computer
We mentioned that we can make changes to the Security Group that is mail-enabled in Exchange Server by using the "-BypassSecurityGroupManagerCheck" parameter. Another method is to provide a Managed By assignment via Active Directory Users and Computer.
- You open the group you want to change via Active Directory Users and Computer (ADUC).
- We click on the "Change" button on the Managed by tab.

- You can make changes by adding the users you want to add from this section.
In this article, we talked about the solutions to the error “You don't have sufficient permissions. This operation can only be performed by a manager of the group.” I hope it was useful.