Unable to connect to Mongodb with SSL Certificate using MongoClient in Node Js Script

[JiyaKhan1]

Hi Team,

I'm trying to connect to MongoClient using Node Js Script.

While i'm passing the same certificate what we used earlier to connect through mongoose.connect . 
==========================================================
var MongoClient = require("mongodb").MongoClient,
 f = require('util').format,
 fs = require('fs');

const options = {
  server: {
  //sslValidate:true,
sslCA:fs.readFileSync("/etc/ssl/mongo-certs/client-combined.crt"),
  sslKey:fs.readFileSync("/etc/ssl/mongo-certs/client.key"),
  sslCert:fs.readFileSync("/etc/ssl/mongo-certs/client.crt"),
  }
}
MongoClient.connect("mongodb://username:password@hostname:27017/databasename?ssl=true&authSource=admin",options,

function (err,database) {
                console.log("Not Connected");
                if (err) return console.error(err);

                console.log("We are connected");
                        });
 
===================== Can you please help on this.. Log is saying as Below ============
I'm getting Below Error 

2020-07-05T11:52:44.869+0000 I ACCESS [conn805] authenticate db: admin { authenticate: 1, user: "myassistroot", nonce: "5be2405f5a0d1eed", key: "d140b8834a2f96624991bfa9cdf911df", $db: "admin" }