unable to generate AA SAML metadata

Hi, im trying to use AA as IDP, to generate SAML metadata from policies>web authentication, ive put in the AA server IP and trying to download the SAML2.0 metadata and got error.

Below is the error

{
  "Fault":{
    "Code":{
      "Value":"Sender",
      "Subcode":{
        "Value":"XDAS_OUT_INVALID_INPUT"
      }
    },
    "Reason":{
      "Text":"No handler defined for protocol"
    }
  }
}