KDE desktop does not recognize network-manager plugins

[Reza Housseini]

Hi Guixers

I tried to use the network-manager-openconnect and network-manager-vpnc 
plugins in KDE with the following setup:

  (network-manager-service-type
    config => (network-manager-configuration
      (inherit config)
      (dns "dnsmasq")
      (vpn-plugins
      (list network-manager-openconnect
            network-manager-vpnc))))

but KDE desktop does not recognize the plugins (they are not visible in 
the "Connections" menu and also on the command line when running nmcli.

The same setup works fine on GNOME.

Thanks for any help!

Best,
Reza