I am trying to post XML data to an external service using an endpoint WSDL. I have set up a Named Credential in Salesforce with authentication. When I run the code below I get the following error:

<faultstring>The endpoint reference (EPR) for the Operation not found is [MY ENDPOINT] and the WSA Action = null</faultstring>

I also have the below test which fails:

System.assert(header != null);

Here is the code I'm running using Execute Anonymous:

String xmlstring = '';
DOM.Document doc = new DOM.Document();
String soapNS = 'http://schemas.xmlsoap.org/soap/envelope/';
String xsi = 'http://www.w3.org/2001/XMLSchema-instance';

dom.XmlNode envelope = doc.createRootElement('Envelope', soapNS, 'soapenv');
envelope.setNamespace('xsi', xsi);
envelope.setAttributeNS('schemaLocation', soapNS, xsi, null);
dom.XmlNode header = envelope.getChildElement('Header', soapNS);

dom.XmlNode body = envelope.addChildElement('Body', soapNS, null);

dom.XmlNode products = body.addChildElement('products', null, null);
dom.XmlNode body1= products.addChildElement('product', null, null);

xmlstring = doc.toXmlString();


HttpRequest req = new HttpRequest();
//call out to Vendavo (this doesn't work)
req.setHeader('Content-Type', 'text/xml');
Http http = new Http();
HTTPResponse res = http.send(req);
System.assert(header != null);

if (res.getStatusCode() < 200 || res.getStatusCode() > 300) {
    String fullBody = '';
    for (Integer i = 0; i < res.getBody().length(); i=i+300) {
        Integer iEffectiveEnd = (i+300 > (res.getBody().length()-1) ? res.getBody().length()-1 : i+300);

    System.debug('The status code returned was not expected: ' +
                 res.getStatusCode() + ' ' + res.getStatus());
} else {
    System.debug('body: ' + res.getBody());

I have tried running the full code from the example here using my endpoint but still encounter the same issues. I don't know how to determine if I am setting the header wrong or if there is an issue with the endpoint I have been given.

Thanks for any help

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