调用Twilio Edit Conversation Participant API修改参与者属性失败求助

我正尝试调用Twilio Conversations Service的API，将Google Sheets中的CRM数据关联至Twilio Frontline App，但在修改对话参与者属性时遇到问题：调用API后能收到对应参与者的响应信息，但attributes字段始终显示为"{}"，没有成功设置我传入的属性。

我的Google Apps Script代码 #

function editParticipantAttributes() {
  
  var twUrl = 'https://conversations.twilio.com/v1/Conversations/' + chSid + '/Participants/' + mbSid;
  
  var options = {
    method: 'post',
    headers: {
      'Authorization': twAuthHeader,
    },
    followRedirects: true,
    muteHttpExceptions: true,
    payload: {attributes: JSON.stringify({
      customer_id: '1',
      display_name: 'First Last'
      })
    }
  }

  var response = UrlFetchApp.fetch(twUrl, options);
  Logger.log(response)
}

Twilio官方提供的cURL示例 #

curl -X POST "https://conversations.twilio.com/v1/Conversations/CHXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Participants/MBXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX" \
--data-urlencode "DateUpdated=2019-05-15T13:37:35Z" \
-u $TWILIO_ACCOUNT_SID:$TWILIO_AUTH_TOKEN

Twilio关于attributes参数的说明 #

这是一个可选的字符串元数据字段，可用于存储任意数据。如果指定该字段，其字符串值必须包含结构有效的JSON。请注意，如果未设置attributes，将返回"{}"。

我收到的API响应内容 #

{"last_read_message_index": null, "date_updated": "2023-05-25T00:45:09Z", "last_read_timestamp": null, "conversation_sid": "CHXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", "account_sid": "ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", "url": "https://conversations.twilio.com/v1/Conversations/CHXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX/Participants/MBXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", "date_created": "2023-05-24T23:05:37Z", "role_sid": "RLXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", "sid": "MBXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX", "attributes": "{}", "identity": null, "messaging_binding": {"proxy_address": "+1XXXXXXXXXX", "type": "sms", "address": "+1XXXXXXXXXX"}}

内容的提问来源于stack exchange，提问作者Patterson Park Music