If the AP is successfully converted to a campus AP, you will no longer be able to login. So if you have a login prompt, it is not converted to a Campus AP.
The console of a campus AP (either native or cobverted) will show a prompt like this on the console:
shutting down watchdog process (nanny will restart it)...
<<<<< Welcome to the Access Point >>>>>
password: <if you type the AP group password here>
~ #
If you want to troubleshoot the conversion process, run after the conversion started the command:
show log convert
And on the controller, a 'show log all' to check if the AP is connecting to the controller.