Each prepared cluster in VMware NSX for vSphere 6.x must have only one ESX Agent Manager (EAM) agency. In some cases, you may see duplicate agencies for a cluster.
This article provides steps to delete duplicate EAM agencies in a cluster.
Note: There is no automatic detection or deletion of duplicate agencies. They should have no impact on running configuration or data traffic. However, duplicate agencies on a cluster can cause problems during upgrade. Therefore, VMware recommends to eliminate duplicate agencies.