User agent(browser) doesn't prompt for credentials over https

When I send this request using soap envelope over http UA asks for credentials. When I send it over https UA doesn't ask for credentials but returns 401 error.
I need user to enter credentials this way.

var wsUrl = config.identityServerURL + "/services/RemoteUserStoreManagerService.RemoteUserStoreManagerServiceHttpsSoap11Endpoint/";
namesToEnable.forEach(function (name) {

var soapRequest = '<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ser="http://service.ws.um.carbon.wso2.org" xmlns:xsd="http://common.mgt.user.carbon.wso2.org/xsd"> ' +
'<soapenv:Header/> ' +
'<soapenv:Body> ' +
'<ser:setUserClaimValues>' +
'<ser:userName>' + name + '</ser:userName>' +
'<ser:claims> <!--Optional:--> ' +
'<xsd:claimURI>http://wso2.org/claims/identity/accountDisabled</xsd:claimURI> <!--Optional:--> ' +
'<xsd:value>false</xsd:value> </ser:claims> <!--Optional:--> ' +
'<ser:profileName></ser:profileName> </ser:setUserClaimValues> ' +
'</soapenv:Body></soapenv:Envelope>';

var xmlhttp = new XMLHttpRequest();
xmlhttp.open('POST',
wsUrl, true);

var sr = soapRequest;

xmlhttp.onreadystatechange = function ()
if (xmlhttp.readyState == 4)
if (xmlhttp.status > 200 < 300)
console.log('DONE');
sap.ui.getCore().byId("DialogOnEnableUser").close();
sap.m.MessageToast.show("User successfully enabled", duration: 1000);
else
console.log('ERR soap req');


;
// Send the POST request
xmlhttp.withCredentials = true;
xmlhttp.setRequestHeader("SOAPAction", "urn:setUserClaimValues");
xmlhttp.setRequestHeader('Content-Type', 'text/xml');
xmlhttp.send(sr);


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