No restart the AP, but factory reset the AP... was this working fine before and then you upgraded the vWLC? Need to understand a bit if this was working prior or not and what has changed. The only way to see if this is an AP issue is to factory reset and also erase the nvram of the AP so it's like a brand new AP out of the box.
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It has never worked, this is a new build using some older AP's as we had those lying around still, all AP's were set to defaults using the button prior to being added to the new situation, they "join", the right software is downloaded automatically but they never truely work.
I have seen on post which is kind of similar but that never had an solution
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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