Seems like you have been using mac-radius authentication for authentication. Have you made sure the end user device's mac address has been registered already ? You have the option of registering the device locally on the switch or through backend radius/ldap server. Where did you register the device ? You can capture packets on the switch interface having trouble with authentication. Try to capture packets on the both end user interface on the switch as well as on the feed interface. The captured packet on the feed should tell if you are receiving the approriate radius access accept or radius access reject message.
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