On the device itself attempt to access http website that should trigger the redirect to the captive portal.  If still does not work you will need to check with captures whether client device is sending the GET request AP is re-directing to the right splash client is following the re-direct ... View more

You can also use two additional features within the dashboard to help you make the decision  Network Like Yours allows you to compare your current setup versus other networks of the same characteristics Summary Report to check the usage of particular SSID to justify whether it's still needed or not ... View more