Check whether enable dhcp snooping on AP, if enabled, need to add ip dhcp snooping trust on the uplink interface of AP.
710#con ter
710(config)#int gi 0/1
710(config-if-GigabitEthernet 0/1)#ip dhcp snooping trust
710(config-if-GigabitEthernet 0/1)# encapsulation dot1Q 1
710(config-if-GigabitEthernet 0/1)# end
710#wr
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