Segment not showing in XRay trace for Router.post

Hello,
I'm trying to add a XRay segment to my NodeJs code that user express router to process incoming POST requests. I've added the openSegment/closeSegment calls around my router.post() method, but I don't see the segment in the XRay trace. I'm very new to this, so I'm probably missing something. Any help would be appreciated. Source code below:

var AWSXRay = require('aws-xray-sdk');
const XRayExpress = AWSXRay.express;
const router = require("express").Router();
const DB = require("../../db/oracle/oracleDB");

router.use(XRayExpress.openSegment('MemberGroupId'));
/**

• POST route
  */
  router.post("/", async (req, res) => {
  const { patientId, dbName } = req.body;
  let memberLookUpObj = {
  payload: {
  cardHolderId: "",
  groupId: "",
  relationshipCode: "",
  },
  msg: "",
  };
  ... remaining source
  });

router.use(XRayExpress.closeSegment());

Thanks,
Chris