How to fix 'Error: querySrv EREFUSED' when connecting to MongoDB Atlas?

I am new to MongoDB 4.0.6 and tried to implement it into my website using Node/Express.js, but when I try to connect to mongodb+srv://${process.env.MONGOUSER}:${process.env.MONGOPASS}@main-03xkr.mongodb.net/main I'm getting this error:

{ Error: querySrv EREFUSED _mongodb._tcp.main-03xkr.mongodb.net at QueryReqWrap.onresolve [as oncomplete] (dns.js:199:19) errno: 'EREFUSED', code: 'EREFUSED', syscall: 'querySrv', hostname: '_mongodb._tcp.main-03xkr.mongodb.net' }

I've tried connecting to mongodb://localhost:27017/main, but this does seem work.

Here is the relevant code:

require('dotenv').config();const mongoose = require('mongoose');// Databaseconst uri = `mongodb+srv://${process.env.MONGOUSER}:${process.env.MONGOPASS}@main-03xkr.mongodb.net/main`;const localURI = 'mongodb://localhost:27017/main';var Project = require('./models/project');mongoose.connect(uri, { useNewUrlParser: true });const db = mongoose.connection;db.once('open', () => console.log('Successfully connected to MongoDB'));db.on('error', (e) => console.log(e));// Routesapp.get('/', (req, res) => {  Project.find({}, (e, projects) => {    if (e) console.log(e);    res.render('home.ejs', {      projects: projects    });  });});

So does anyone know how to fix this error and maybe explain what is happening here?