PHP Fatal error: Uncaught SoapFault exception: [HTTP] Unauthorized in - php

Question

I want request-response with wsdl in php
But I getting error
"Fatal error: Uncaught SoapFault exception: [HTTP] Unauthorized"
WSDL https://servis.turkiye.gov.tr/services/g2g/kdgm/test/uetdsarizi?wsdl
My code in index.php
$istek = new SoapClient('https://servis.turkiye.gov.tr/services/g2g/kdgm/test/uetdsarizi?wsdl');
$auth = new stdClass();
$auth->Username = '999999';
$auth->Password = '999999testtest';
$header = new SoapHeader('https://servis.turkiye.gov.tr/services/g2g/kdgm/test/uetdsarizi?wsdl', 'AuthHeader', $auth, false);
$istek->__setSoapHeaders($header);
echo "<pre>";
print_r($istek->__getTypes());
echo "</pre>";
echo "<hr /><br /><br /><br />";
$sonuc = $istek->seyahatIzinKontrol(array(
'wsuser' => array(
'kullaniciAdi' => '999999',
'sifre' => '999999testtest')
,
'tcKimlikNo' => '15058023598')
);
if ($sonuc->seyahatIzinKontrol) {
echo 'OK';
}else {
echo 'ERROR';
};
Here is the error I'm getting:
Fatal error: Uncaught SoapFault exception: [HTTP] Unauthorized in C:\xampp\htdocs\index.php:72 Stack trace: #0 [internal function]: SoapClient->__doRequest('<?xml version="...', 'https://servis....', 'http://uetds.un...', 1, 0) #1 C:\xampp\htdocs\index.php(72): SoapClient->__call('seyahatIzinKont...', Array) #2 {main} thrown in C:\xampp\htdocs\index.php on line 72
What my error?