RADIUS Error

[cyberbot]

hi guys,
i've created a VPN over domain controller following this tutorial
https://doc.pfsense.org/index.php/OpenVPN_with_RADIUS_via_Active_Directory
after al is created and configured , tried to check the authontication
i've got the following error :
input errors were detected:
Authentication failed.
i tried and disabled Windows firewall but no vail.
any suggestions how to get this working?