Single domain, single forest, one Exchange server, version 2013. When trying to add a member to a group (or DL), using ECP, it tells me "You don't have sufficient permissions. This operation can only be performed by a manager of the group." But this is absurd, because on the membership approval page of the group's properties, the check-box for Owner Approval is required is NOT SELECTED. It never was selected. I have been able to add members to groups using ECP before. The Admin account is a member of all the Exchange security groups that have anything to do with administering the server. I know I can go into AD Users and Computers and make the changes, but I think it is absurd the way the ECP won't let me administer the server when I am supposedly the administrator. Is there any way to fix this? I can't add the administrator to be the owner of the groups either. It gives the exact same error message. With NTFS folder and file permissions, an administrator can take ownership of the files. Is there a way to take ownership of these recipient groups in Exchange?
Many thanks,
Sam S.