nodemailer with XOauth2 settings says bad credentials - node.js

Question

I have the following node code:
var nodemailer = require("nodemailer");
var xoauth2 = require('xoauth2');
/*
Here we are configuring our SMTP Server details.
STMP is mail server which is responsible for sending and recieving email.
*/
var smtpTransport = nodemailer.createTransport({
service: "Gmail",
host: "smtp.gmail.com",
auth: {
XOAuth2: {
user: "buckscountytourofhonor#gmail.com",
pass: "****",
clientId:"myclientidenteredhere",
clientSecret:"mysecretenteredhere",
refreshToken:"mytokenenteredhere"
}
}
});
module.exports = function(app, passport){
app.get('/send',function(req,res){
var mailOptions={
to : 'buckscountytourofhonor#gmail.com',
from: req.query.email,
subject : req.query.subject,
text : req.query.name +": "+req.query.message
}
console.log(mailOptions);
smtpTransport.sendMail(mailOptions, function(error, response){
if(error){
console.log(error);
res.end("error");
}else{
console.log("Message sent: " + response.message);
res.end("sent");
}
});
});
I am currently following this tutorial. Actually followed many, but this is the most succinct.
I am getting the following error:
Error: invalid login: 535-5.7.8 username and password not accepted
Can anyone help me figure out what I am missing, I have been spending over 3 hours researching this.

Answer 1

I seem to have faced this issue just now. I have an older implementation working just fine with xoauth, another app with the same code but a more recent nodemailer install did give
Invalid login: 535-5.7.8 Username and Password not accepted.
I went from xoauth2 like so
var generator = require('xoauth2').createXOAuth2Generator({
user: 'xxx',
clientId: 'xxx',
clientSecret: 'xxx',
refreshToken: 'xxx'
});
and
var transporter = nodemailer.createTransport(({
service: 'gmail',
auth: {
xoauth2: generator
}
to
var transporter = nodemailer.createTransport(({
service: 'gmail',
auth: {
type: 'OAuth2',
user: 'xxx',
clientId: 'xxx',
clientSecret: 'xxx',
refreshToken: 'xxxx'
}
}));
This was then working for me. Not sure if thats it but worth a try. I did follow the same tutorial for the Gmail-setup, this did work in my earlier implementation and again with the new project.