We ran into the same issue. Ordered a few C9200CX switches and once they arrived realised we do not have the correct console cable.With the suggestions from previous post I got it working.I used a generic USB to Micro  USB cable (charging cable for m...

In my case it was a dodgy ethernet cable. It was not broadcasting the SSID configured but I could still see the AP in the 9800 controller though. 

I was facing a similar issue where logs would not populate after a version upgrade. I have tried replacing Cisco ISE messaging service certs, regenerate ISE root CA , rebooting to no avail. But eventually i got the logs fixed by resetting the monitor...