Problema de autenticação

Boa tarde, estou tentando fazer o teste do e-mail, utilizando as credenciais disponibilizada no projeto do curso, mas na hora de rodar o teste não é possível autenticar. Tem alguma outra credencial que posso utilizar? Ou errei em alguma parte do código?

(node:38834) ExperimentalWarning: VM Modules is an experimental feature. This feature could change at any time
(Use node --trace-warnings ... to show where the warning was created)
FAIL src/test/config/disparoEmail.test.js
Testando disparo de email
✕ O sistema deve validar a conexão com o sistema de disparo de email (731 ms)

● Testando disparo de email › O sistema deve validar a conexão com o sistema de disparo de email

Invalid login: 535 Authentication failed

  at SMTPConnection._formatError (node_modules/nodemailer/lib/smtp-connection/index.js:790:19)
  at SMTPConnection._actionAUTHComplete (node_modules/nodemailer/lib/smtp-connection/index.js:1548:34)
  at SMTPConnection.<anonymous> (node_modules/nodemailer/lib/smtp-connection/index.js:546:26)
  at SMTPConnection._processResponse (node_modules/nodemailer/lib/smtp-connection/index.js:953:20)
  at SMTPConnection._onData (node_modules/nodemailer/lib/smtp-connection/index.js:755:14)
  at TLSSocket.SMTPConnection._onSocketData (node_modules/nodemailer/lib/smtp-connection/index.js:193:44)

Test Suites: 1 failed, 1 total
Tests: 1 failed, 1 total
Snapshots: 0 total
Time: 0.964 s, estimated 3 s
Ran all test suites matching /src/test/config/disparoEmail.test.js/i.

disparoEmail.test.js

import { describe, expect, it } from '@jest/globals';
import nodemailer from 'nodemailer';
import 'dotenv/config';

const transporter = nodemailer.createTransport({
  host: process.env.HOST_EMAIL,
  port: 587,
  secure: false, // upgrade later with STARTTLS
  auth: {
    user: process.env.USER_EMAIL,
    pass: process.env.PASS_EMAIL,
  },
});

const verificaConexao = () => new Promise((resolver, reject) => {
  transporter.verify((error, success) => {
    if (error) {
      reject(error);
    } else {
      resolver(success);
    }
  });
});

describe('Testando disparo de email', () => {
  it('O sistema deve validar a conexão com o sistema de disparo de email', async () => {
    const estaConectado = true;

    const validarConexao = await verificaConexao();

    expect(validarConexao).toStrictEqual(estaConectado);
  });
});

.env

HOST_EMAIL=smtp.ethereal.email
USER_EMAIL=l4fb7ukamgjlh2f6@ethereal.email
PASS_EMAIL=1WRdhg3EGfXtfW5XFQ

Project no GitHub
https://github.com/fmatheusm/nodejs-api-teste