When you configure option 43 you should return Management IP Address only so that APs can discover the controller and once AP discovers the controller via knowing its Management IP Address it can join the controller and then all internal communication between AP and controller will happen through AP-Manager IP Address which is done automatically and no manual intervention is required.
Transferring Crash file from standby: Login to the Active WLC in HA.
From CLI: (Cisco Controller) >transfer upload datatype crash (Cisco
Controller) >transfer upload filename (Cisco
Controller) >transfer upload mode tftp (Cisco Controller) >transfer
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