Please correct me if I am wrong, you created an External Portal and would like to Map it on the vSZ. This can be achieved by configuring a "Hotspot (WISPr)" WLAN and selecting the Under the Hotspot Portal -> Create -> Enter the Portal name and select the Logon URL as External.
External: Indicates the external URL of the subscriber portal. SelectingExternalprovides an option to reroute an unauthorized user to a primary location. You can set the primary location inRedirect unauthenticated users. If an unauthorized user is rerouted, the AP redirects the UE to a backup portal.
Please let me know if the above helps. Thank you! Amith