javascript smtpjs sendEmail not working with smtp.gmail.com SecureToken

I am trying to send smtp email using javascript in html contact page

I am able to send email when I hardcode email id and password but when I generate SecureToken using https://smtpjs.com/, it is not sending email BTW it shows the successful THEN part message “mail sent successfully” (check below code)

I am volunteering to do this work for non-profit org, so there isn’t much options get personal help thank you

====== Email is working with below code (with out SecureToken) =========================

<script type="text/javascript">
function sendEmail() {
     var number=document.getElementById('number').value;
     var sname=document.getElementById('name').value;
     var semail=document.getElementById('semail').value;
     var message=document.getElementById('message').value;
     var smsg='<html><strong>From :</strong>' + sname + '<br/><strong>Contact :</strong>' + number + '<br/><strong>Email :</strong>' + semail +'<br/><strong>Message:</strong>' + message + '</html>';
 
Email.send({
    Host: "smtp.gmail.com",
    Username:'siteEmailID@gmail.com',
    Password:'gmailpassword',
    To : 'siteEmailID@gmail.com',
    From : "siteEmailID@gmail.com",
    Subject : "Website Email",
    Body : smsg
    }).then(
        message => alert("mail sent successfully")
    );
}
</script>

=============== But not working with the SecureToken =======================

<script type="text/javascript">
function sendEmail() {
     var number=document.getElementById('number').value;
     var sname=document.getElementById('name').value;
     var semail=document.getElementById('semail').value;
     var message=document.getElementById('message').value;
     var smsg='<html><strong>From :</strong>' + sname + '<br/><strong>Contact :</strong>' + number + '<br/><strong>Email :</strong>' + semail +'<br/><strong>Message:</strong>' + message + '</html>';
 
Email.send({
    SecureToken : "11xxxxxxx-81xx-4fxx-a7xx-e8xxxxxxxeea",
    To : 'siteEmailID@gmail.com',
    From : "siteEmailID@gmail.com",
    Subject : "Website Email",
    Body : smsg
    }).then(
        message => alert("mail sent successfully")
    );
}
</script>