What AP model is this ? Are you able to get AP console output to see what's going on.Make sure AP has got an IP & it can reach WLC mgt IP. Also make sure MAC address you entered it AP ethernet MAC & not radio MAC.
Here is how you can statically configure WLC IP on AP to register, Try this with one AP & see whether it get registered
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
This is the start of a display filter cross reference between Wireshark
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