My first meeting with the C1532 access point tripped me somewhat.
Due to the fact that this outdoor access point is mesh capable, it differs somewhat from your ordinary indoor access points.
This access point requires to be authorized prior to joining the controller. If it is not authorized you can find entries in Most Recent Traps such as
AAA Authentication Failure for Client MAC: 00:af:1f:62:c2:b0 UserName:70e423da2de1 User Type: WLAN USER Reason: Authentication failed
In order to authorize an access point, you need to go to Security > AAA > AP Policies and add the access point as show below.
Hope this helps,