Manual unmanaged desktop pools are typically used when the target desktops are created outside the Horizon View and vSphere environments, such as physical desktops or virtual desktops created using storage-array-based cloning features. Regardless of where these desktops are physically located, they must have the Horizon View agent installed in order to be added to manual unmanaged desktop pools.
Prior to creating the manual unmanaged desktop pool, at least one supported desktop with the Horizon View agent installed must be available. This desktop must not be assigned to any existing desktop pools, as it will be added to the new manual unmanaged desktop pool during the pool-creation process.