Hello,
Is the helpdesk having the same subnet IP as the remote user pool ? If not, make sure you route accordingly in the internal network.
This might happen , if the firewall feature of the VPN client is enabled , which might block any access to the client from foreign parties. make sure you allow the helpdesk LAN, if any VPN firewall is enabled.
is split tunneling enabled ? just have a look at this too.
All the best !