Test fails for Infra Server and VDI server

Hi,

I've deployed View Planner 4 but when I add the Infra Server (vCenter Server 6.7 U1), I get the following error when I test: Failed to find VM's {}

When I add and test the VDI Server (Connection Server, Horizon 7.7), I get the error: "Something went wrong".

All servers are on the same subnet/VLAN.  Any ideas what why it's doing that?

thanks.