/v2/calls/extensive - Error "Request message not readable"

const myHeaders = {
   'Content-Type': 'application/json',
   'Authorization': 'Basic XXXXXX'
 };

function findGongCallByDate(when) {

  const raw = JSON.stringify( {
    'contentSelector': {
      'context': 'None',
      'exposedFields': {
        'collaboration': {
          'publicComments': true
        },
        'content': {
          'pointsOfInterest': true,
          'highlights': true,
          'callOutcome': true,
          'keyPoints': true
        },
        'parties': true
      }
    },
    'filter': {
      'fromDateTime': '2024-10-18T07:00:00-08:00',
      'toDateTime': '2024-10-21T09:00:00-08:00'
    }
  } );

  const requestOptions = {
    method: "POST",
    headers: myHeaders,
    body: raw,
    redirect: "follow",
    muteHttpExceptions: true
  };

  var response = UrlFetchApp.fetch("https://api.gong.io/v2/calls/extensive", requestOptions);

  console.log(response.toString());

}


function getAllGongCalls()
{
  const requestOptions = {
    method: "GET",
    headers: myHeaders,
    redirect: "follow"
  };

  var response = UrlFetchApp.fetch("https://api.gong.io/v2/calls", requestOptions);

  console.log(response.getContentText());
}

The above code has 2 functions.

1. getAllGongCalls - which works great.

2. findGongCallByDate - which fails with the below error

{"requestId":"1efp7ktsac4zd2g13el","errors":["Request message not readable"]}

Any idea what is wrong with it?