Steam authorization with photon self-hosted server?

How do you setup a self-hosted server with Steam authorization. I modified my config file “Photon.LoadBalancing.dll.config” and added the following:

  <AuthSettings Enabled="false" ClientAuthenticationAllowAnonymous="false">
    <AuthProviders>
      <AuthProvider Name="Steam"
                    AuthenticationType="1"
                    apiKeySecret = "My API key"
                    appid = "<My AppID>"
                    verifyOwnership = "true"
                    verifyVacBan = "true"
                    verifyPubBan = "true"
                    RejectIfUnavailable = "false" />-->
    </AuthProviders>
  </AuthSettings>

However, with this change, the server can no longer start. Any help would be appreciated!