WLC client wireless connection unavailable

[CCC3]

WLC: 3504 (8.10.171.0)

AP: 9115AXI

security : PSK

Flexconnect

Wireless cannot be connected.

Debug Client Results

You can see the following.

Client deletion code: default reason code for all client deletion requests

Cause: Error while configuring PMIPv6 MAG/ Error while creating data plane rules for client/ Error while redirection URL exists and Radius NAC with mac filtering is set, pending for posture/ no dot1x control block found for client, internal error/ client did not respond to retries for SA queries (802.11w)/ Default for flex local authentication client/ No client ACL in AP

WLC/AP is sending a connection response to the client with status code 12 = Unknown or invalid SSID

Is there anyone who knows?

If necessary, the entire debug log can also be delivered.

[marce1000]

 - As per https://www.cisco.com/c/en/us/support/docs/wireless/wireless-lan-controller-software/200046-tac-recommended-aireos.html   upgrade to 8.10.196.0 first and check again , especially and also because a modern 9115AXI is in use here!

 M.

[Rich R]

Show the full configuration of the WLAN: 
config paging disable
show wlan <WLAN ID>