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Hi, the support of 802.11AX begins in version 8.9.100.You can find this information in the release note : https://www.cisco.com/c/en/us/td/docs/wireless/controller/release/notes/crn89.html Please rate useful responses
You can use your own PKI with xca (or another tool) or you can request a public certificate (like verisign etc). I'm using using xca because is very simple linux tool.
There is no licence for using AVC.
I had the same problem, I updated the FUS (Field Upgrade Software).
Did you try it ?
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Filipe