Add a IgniteNet site by going to Switch Site -> Create New location -> IgniteNet.

Enter a name for the location and click on Save.
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Navigate to IgniteSites tab and click on New to add a new AP.

Enter the Name and click on Save.

Note down the generated Identity and Secret.
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Login to your IgniteNet cloud account and navigate to WiFi Access.

Use Edit option to edit the SSID you like to enable Hotspot on.
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Scroll down to Network Settings and change behaviour to Hotspot Controlled.
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Now toggle Hotspot Enabled to active and select mode as external captive portal.
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Go further down and enable Radius Auth.