Client Excluded: MACAddress:2c:be:08:f5:14:d6 Base Radio MAC :2c:d0:2d:91:54:86 Slot: 1 User Name: unknown Ip Address: unknown Reason:Attempted to use IP Address assigned to another device. ReasonCode: 3

When you get

Client Excluded: MACAddress:2c:be:08:f5:14:d6 Base Radio MAC :2c:d0:2d:91:54:86 Slot: 1 User Name: unknown Ip Address: unknown Reason:Attempted to use IP Address assigned to another device. ReasonCode: 3
you can debug the already used ip by enable dhcp debuging og the wlc controller

you can enable debuging by using the following command

you can look for the event

then you know that the ip that is already in use is 10.16.0.254, and you can exclude it on the dhcp server

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