Sending mail via nodemailer

So I have just finished changing my domain to zoho. I also verified SPF and DKIM.

So I first tried to send mail with this:

const mailer = nodemailer.createTransport({
    host: 'smtp.zoho.eu',
    port: 465,
    secure: true,
    auth: {
        user: 'no-reply@example.com',
        pass: 'pass',
    }
});
const a = await mailer.sendMail({
     from: 'no-reply@example.com',
     to: 'mypersonal@email.com',
     subject: 'Hello',
     text: 'eeee'
});

I tried for password the normal password I use to login to web, and also I generetaed app password, but none of them work.

I always get the same response:

{

"code": "EENVELOPE",

"response": "530 5.5.1 Authentication Required.",

"responseCode": 530,

"command": "MAIL FROM"

}

After few hours of trying, changing and googling, I decided to try different approach, and send mail via DKIM. But to create transport, I need to give it privateKey.

Where is the private key for the public key you provided me in DKIM settings?