/sitemap.xml endpoint not functioning in MVC 5

[NightOwl888]

This issue is being caused by a bug in the MVC 5 NuGet package, which doesn't always deploy the following elements into the root web.config file.

  <system.webServer>
    <modules>
      <remove name="UrlRoutingModule-4.0" />
      <add name="UrlRoutingModule-4.0" type="System.Web.Routing.UrlRoutingModule" />
    </modules>
  </system.webServer>

In the meantime until this is fixed, you can work around by copying the configuration above into your root web.config file manually.