Radius servers are authentication servers, which clients would need to authenticate against when connecting to an AP, which would all happen before a switch is involved with the traffic. While I'm sure there is a switch on the backend network, switches do not typically act as Radius servers, so I am trying to clarify what device is hosting the Radius server. I appreciate the screen shot you sent earlier showing the radius servers in your device list, but I can't tell what model device that is from the hostname of the device. Do you have a switch, set to router mode, acting as a Radius server?
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