I have 1 AP out of ten not joining the controller. I connected the access point to the network and I checked its boot. the access point reaches LWAPP Discovery" and then give me console input. I hard reset the access point and I hard coded an IP address for the AP the AP joins the controller, but when I reset it to assign it to another controller it did not join again.
why the discovery process is not showing the DHCP option 43 configured and DNS for CISCO-LWAPP-CONTROLLER configured on the DNS. All the access point is operating normally except this one. it has many certificate inside, why a hard reset did not work to solve the problem?