Since Zoho CRM for RingCentral isn't supported by RingCX, I'm trying to call the Zoho CRM API using the WWW tool in RingCX Admin to find a contact using a phone number. No matter what I pass in the header, I get this error:

 {

  "readyState": 0,

  "status": 0,

  "statusText": "error"

}

Is there something I can do so I can get a non-error result in this tool? The exact same call works fine in Postman...