What I understand from your post is that the authentication is not handled by your IAS server. IF I am correct, the problem might be with the "Allow AA override" option disabled in your WLAN. If it is enabled, then the AAA server or your IAS server will override the security parameters set locally on the controller.
So, first ensure whether "Allow AAA override" is enabled under Controller--->WLAN field.
Also, chek out the logs of the IAS server for obtaining more info on this.
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