How to send authentication email with sendgrid - node.js

Question

I have these lines of code, but having difficulty sending mail using SendGrid. I need a working guide to what can be done.
const sgMail = require('#sendgrid/mail')
sgMail.setApiKey(process.env.MAIL_KEY)
const { name, email, password } = req.body;
console.log(name, email, password)
const errors = validationResult(req);
if (!errors.isEmpty()) {
const firstError = errors.array().map(error => error.msg)[0];
return res.status(422).json({
errors: firstError
});
} else {
User.findOne({
email
}).exec((err, user) => {
if (user) {
return res.status(400).json({
errors: 'Email is taken'
});
}
});
const token = jwt.sign(
{
name,
email,
password
},
process.env.JWT_ACCOUNT_ACTIVATION,
{
expiresIn: '5m'
}
);
const emailData = {
from: process.env.EMAIL_FROM,
to: email,
subject: 'Account activation link',
html: `
<h1>Please use the following to activate your account</h1>
<p>${process.env.CLIENT_URL}/users/activate/${token}</p>
<hr />
<p>This email may containe sensetive information</p>
<p>${process.env.CLIENT_URL}</p>
`
};
sgMail.send(emailData)
.then(sent => {
return res.json({
message: `Email has been sent to ${email}`
});
})
.catch(err => {
console.log(err)
return res.status(400).json({
success: false,
errors: errorHandler(err)
});
});
The above code is the code I have, but I get the error described in the image which is the catch to the .then of the sgMail.send. I get a forbidden error in the console. I don't know where that is really coming from