try connect using kerio api

app/Http/Actions/TestConnection.php

@@ -6,7 +6,7 @@ use ThurData\Servers\KerioEmail\App\Libs\Kerio\Api;
 use ThurData\Servers\KerioEmail\App\Libs\Kerio\Components\Api\Soap\Client;
 use ThurData\Servers\KerioEmail\App\Traits\ExtensionsCheckerTrait;
 use ThurData\Servers\KerioEmail\Core\App\Controllers\Instances\AddonController;
-use ThurData\Servers\KerioEmail\api\KerioConnectApi;
+use ThurData\Servers\KerioEmail\Api\KerioConnectApi;
 
 /**
  *