Dear All,

I have Exchange 2010 in our environment, When I want to add any user to any DL group through powershell. It gives an error, but if we add through GUI it works for me. when I have all the required access, even with my colleague has the same issue.

Please find below error. 

You don't have sufficient permissions. This operation can only be performed by a manager of the group.
    + CategoryInfo          : NotSpecified: (:) [Add-DistributionGroupMember], OperationRequiresGroupManagerException
    + FullyQualifiedErrorId : 98DC2EE1,Microsoft.Exchange.Management.RecipientTasks.AddDistributionGroupMember

It looks like the distribution list is actually a security group and you're trying to modify the security group from EMS. try to modify the distribution group (Security group) from windows powershell. Thanks.

Hi prm22mis,

Thank you for your question.

When we open PowerShell, we could right click PowerShell icon and choose run as administrator to check if the issue persist.

We could run the following command to check if you are manager of DL:

Get-DistributionGroup <DL name> | select ManagedBy

If there are any questions regarding this issue, please be free to let me know. 

Best Regard,

Jim