NetBackup for VMware operational notes
In NetBackup 10.5 and later, VMware server asset discovery in the Web UI needs a backup host at NetBackup 10.5 or later
Starting with NetBackup 10.5, the host that is used for credential validation and asset discovery of a VMware server needs to be at version 10.5 or later. Otherwise, the discovery fails. By default, this value is the primary server. If you continue to use the primary server, no changes are needed.