Expose Simple SOAP Service with Basic Auth

I get the following error when using SOAP UI (with Basic Authentication) to call a simple service. How do I configure this service to work? The permission ACL appears to be configured correctly and I’m using the Service Account to connect.

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
   <SOAP-ENV:Header/>
   <SOAP-ENV:Body>
      <SOAP-ENV:Fault>
         <faultstring>[ISS.0088.9430] Handler processing failed on the provider</faultstring>
         <faultactor>http://SERVER/ws/namespace.service:addInts_WSD/namespace_service_addInts_WSD_Port</faultactor>
         <faultcode>SOAP-ENV:Client</faultcode>
         <detail>
            <webM:detailEntry xmlns:webM="http://www.webMethods.com/2001/10/soap/encoding">
               <webM:message xml:lang="">[b]com.webmethods.ws.security.SecurityException: WS Security processing failed : Invalid outbound security policy. Username token assertion not supported in the response[/b]</webM:message>
            </webM:detailEntry>
         </detail>
      </SOAP-ENV:Fault>
   </SOAP-ENV:Body>
</SOAP-ENV:Envelope>