await is only valid in async function error - Azure Function

I'm trying to get my login api working inside azure function, but it keeps saying await is only valid in async function. This is an async function so I'm just super confused.

This line const user = await db.collection('users').findOne({ email: userLoggingIn.email })

is throwing the error.

const jwt = require("jsonwebtoken");
const bcrypt = require("bcrypt");


var MongoClient = require('mongodb').MongoClient;



module.exports = async function (context, req) {


  MongoClient.connect(process.env.CosmosDBConnectionString, (err, client) => {


    let userLoggingIn = ({ email, password } = req.body);

    console.log("userLoggingIn");
    console.log(userLoggingIn.email);
    let send = response(client, context);

    if (err) send(500, err.message);


    console.log("DBNAME: " + process.env.dbName);
    let user;
    let db = client.db(process.env.dbName);


   const user = await db.collection('users').findOne({ email: userLoggingIn.email })



    console.log("USER");
    console.log(user);


  let userName= user.instagramName;
    if (!user) {

      send(401, { message: "Auth failed" });

    }

    const { username } = user;
    console.log("PASSWORD");
    console.log(context.req.password);
    console.log(user.password);
    const goodPassword = bcrypt.compareSync(context.req.password, user.password);

    if (!goodPassword) {
      return send(401, { message: "Auth failed" });

    }

    const token = jwt.sign(
      {
        email: user.email,
        userId: user._id,
        username: userName
      },
      "secret_this_should_be_longer",
      { expiresIn: "1h" }
    );

    context.res = { status: 200, token: token, expiresIn: 3600, userId: user._id, username: username};


  })
}




function response(client, context) {
  return function (status, body) {
    context.res = {
      status: status,
      body: body
    };

    client.close();
    context.done();
  };
}