SharePoint 2013: Custom result source not showing up in the webservice method GetPortalSearchInfo result

I have created my own result source which should be used during the search at some point (via webservice and using the method Query). Settings I used when creating this result source are: - Protocol "SharePoint local" - Type "SharePoint-Search results" - Query transformation left by default for the moment - Login information "Standard authentication"

After calling GetPortalSearchInfo(), I do not get my new result source. This is the XML I am getting as a response:

<?xml version="1.0" encoding="utf-8"?>
  <SiteConfigInfo xmlns="urn:Microsoft.MSSearch.Response.Config">
    <Name>SharePoint 2013 Test-Umgebung</Name>
    <Id>{dbdc8f94-159e-4eeb-a6d6-6825366151fa}</Id>
    <Scopes>
      <Scope>
        <Name>Personen</Name>
      </Scope>
      ...
    </Scopes>
</SiteConfigInfo>

Any idea what I am doing wrong here? Any help would be appreciated. Thanks.