Hyper-v policy error configuration

Hello,

I have some problem with a Hyper-v policy.
We have 2 cluster node with a virtual name

Virtual Name: SYSCLUHVP01S
Node 1: SYSHVP01S01
Node 1: SYSHVP01S02

In the policy I inserted the virtual name, but when click ok after few minutes appear a popup when I read "Please enter a valid Hyper-V machine name".
I have a lot of Hyper-v policies and all work fine.

If I enter the node name the policy accepts the configuration and discover the VM under this node.

Some environment details:

Master server

OS win server 2012 standard edition - NBU ver. 7.7.1

Media server

Appliance 5230 - NBU vers. 7.6.1.2

Host Hyper-v

windows server 2012 R2 Datacenter - NBU version 7.6.1.1

any help is appreciated