Hyperv backup policy config

I'm trying to create policy to backup my VMs on a Windows 2012 R2 Hyperv using netbackup 7.6.0.1.  I installed the client agent on all 4 cluster shared volume nodes. On the Hyperv tab, I entered hyperv cluster name. On the Clients tab, when browse and select the VM to backup nothing shows up. Did I miss something during the policy config? Please help!