VPN configuration no longer accepting valid server connection address

Hi,

We use a VPN configuration in our WMS Admin portal.  Today I needed to make an update to our ;ThinOS 9.x' policy and was met with an unfamiliar error message saying:

"Inpout for [VPNOpenConnectServer] does not match the required input validations"

After a bit of troubleshooting it appears that the WMS portal no longer likes the Cisco AnyConnect connection address we use for our VPN.

The name for our connection is /.  E.g. my.organisation.com/vpnconnection1

It previously had this saved successfully, but now if I try typing this name into the "Server" field box for the VPN connection, it will start displaying an error box as soon as I put in the forward slash, saying "Invalid Server Info.  Please enter valid server information".

Has anyone come across this before, or know of a solution to this error?

Thanks.