Ensure you have the Trustpoint certificate generated with the show command below. !XXXXXX#show wireless management trustpointTrustpoint Name : XXXXX_WLC_TPCertificate Info : AvailableCertificate Type : SSCCertificate Hash : 627cbf6e93c3e1dbf45bf7f094...

I have had this same problem my recommendation is check you wireless drivers. We have older dell that can't see the SSID and others that see the SSID but are unable to communicate.  The laptop with issues is a 5470 Dual Band Wireless-AC 8260 19.50.1....