CW9166I-E AP cannot register to C9800-80 WLC

[pengus]

Cisco Catalyst 9800-80 Wireless Controller version is 17.9.4a. I check compability matrix and no problem to registring ap. But ap logs Discarding msg CAPWAP_WTP_EVENT_REQUEST(type 9) in CAPWAP state: Join(5). and i check AP join statistics on C9800-80 controller  i see Reason for last unsuccessful join attempt :  Unsupported ap. How can register ap to WLC?

[Leo Laohoo]

The SKU starts with "CW".  This means the AP could be shipped to join Meraki Cloud.

[pengus]

if sku end with MR, AP could be shipped to join Meraki Cloud.

[pengus · Accepted solution]

This issue was likely occurring in countries like Turkey that transitioned to Wi-Fi 6 later. I had activated different regulatory domains on the WLC, but I couldn't register the 9166 AP. When I upgraded the WLC to version 17.9.5, the problem was resolved, and the 9166 AP was able to register with the WLC.