Active Directory Authentication error

[s31t0n]

Hello all,
actually having issues to integrate AD authentication,
as you can see on the configuration file i left a hybrid authentication, so i can have local and Ad users to authenticate, but actually only local user can authenticate.

• Kloudspeaker v2.7.30
• Windows 10.
• Xampp
• Configuration.php

	        "authentication_methods" => array("ldap","pw"),
                "ldap_use_starttls" => FALSE,
                "ldap_server" => "ldap://ad-test.tstlab.local:389",
                "ldap_conn_string" => "@tstlab.local",
		"ldap_search" => "DC=tstlab,DC=local",
		"ldap_base_dn" => "CN=Users,DC=tstlab,DC=local",
		"ldap_bind_dn" => "CN=Tst Lab,CN=Users,DC=tstlab,DC=local",
		"ldap_bind_pw" => "P4s*$w0r.!d0-1",

When trying to authenticate with just username without the suffix, so just typing test1 and the password,i get the following error,

[27-Jul-2019 17:34:43 Europe/Rome] KLOUDSPEAKER ERROR: Failed Kloudspeaker login attempt from [::1], user [test1]
[27-Jul-2019 17:34:43 Europe/Rome] KLOUDSPEAKER ERROR: ServiceException: AUTHENTICATION_FAILED=
[27-Jul-2019 17:34:43 Europe/Rome] KLOUDSPEAKER ERROR: {0:{file:C:\xampp\htdocs\kloudspeaker\backend\include\services\SessionServices.class.php, line:69, function:login, class:Authentication, type:->, args:{0:test1, 1:P4s*$w0r.!d0-1}}, 1:{file:C:\xampp\htdocs\kloudspeaker\backend\include\services\SessionServices.class.php, line:60, function:authenticate, class:SessionServices, type:->, args:{}}, 2:{file:C:\xampp\htdocs\kloudspeaker\backend\include\services\ServicesBase.class.php, line:69, function:processPost, class:SessionServices, type:->, args:{}}, 3:{file:C:\xampp\htdocs\kloudspeaker\backend\include\KloudspeakerBackend.class.php, line:87, function:processRequest, class:ServicesBase, type:->, args:{}}, 4:{file:C:\xampp\htdocs\kloudspeaker\backend\r.php, line:61, function:processRequest, class:KloudspeakerBackend, type:->, args:{0:Request}}}

When trying to authenticate with the username including the suffix, so typing test1@tstlab.local and the password,i get the following error,

[27-Jul-2019 17:37:39 Europe/Rome] KLOUDSPEAKER ERROR: No user found with name [test1@tstlab.local]
[27-Jul-2019 17:37:39 Europe/Rome] KLOUDSPEAKER ERROR: Failed Kloudspeaker login attempt from [::1], user [test1@tstlab.local]
[27-Jul-2019 17:37:39 Europe/Rome] KLOUDSPEAKER ERROR: ServiceException: AUTHENTICATION_FAILED=
[27-Jul-2019 17:37:39 Europe/Rome] KLOUDSPEAKER ERROR: {0:{file:C:\xampp\htdocs\kloudspeaker\backend\include\services\SessionServices.class.php, line:69, function:login, class:Authentication, type:->, args:{0:test1@tstlab.local, 1:P4s*$w0r.!d0-1}}, 1:{file:C:\xampp\htdocs\kloudspeaker\backend\include\services\SessionServices.class.php, line:60, function:authenticate, class:SessionServices, type:->, args:{}}, 2:{file:C:\xampp\htdocs\kloudspeaker\backend\include\services\ServicesBase.class.php, line:69, function:processPost, class:SessionServices, type:->, args:{}}, 3:{file:C:\xampp\htdocs\kloudspeaker\backend\include\KloudspeakerBackend.class.php, line:87, function:processRequest, class:ServicesBase, type:->, args:{}}, 4:{file:C:\xampp\htdocs\kloudspeaker\backend\r.php, line:61, function:processRequest, class:KloudspeakerBackend, type:->, args:{0:Request}}}

Any idea how to get rid oft this error and make sure the user get authenticated?
Thanks.