ASP.Net Core: jQuery AJAX Post sending NULL value to Controller

I have a simple post from form .net core and i want to post to that end point with separate front end html, but i have some problem why the object is always null value form html using post Ajax method

I hope anyone can help me thanks.

public class MessageWeb
{
    public int id { get; set; }
    public string name { get; set; }
    public string email { get; set; }
    public string phone { get; set; }
    public string subject { get; set; }
    public string message { get; set; }
    public DateTime created_date { get; set; }
    public bool is_read { get; set; }
}

logger.LogInformation("inside message web endpoint");
var exist = await db.MessageWebs.Where(m => m.email.ToLower() == model.email.ToLower()).FirstOrDefaultAsync();
if (exist !=null)
{
    return Json(new { Data = "0" });
}
MessageWeb ms = new MessageWeb()
{
    name = model.name,
    email = model.email,
    phone = model.phone,
    subject = model.subject,
    message = model.message,
    created_date = DateTime.Now,
    is_read = false
};
db.MessageWebs.Add(ms);
await db.SaveChangesAsync();
 
await db.SaveChangesAsync();
return Json(new {Data="1"});

<div class="bg-white p-5 contact-form">
<div class="form-group">
    <input type="text" id="name" name="name" class="form-control" placeholder="Your Name" required>
</div>
<div class="form-group">
    <input type="text" id="email" name="email" class="form-control" placeholder="Your Email" required>
</div>
<div class="form-group">
    <input type="text" id="phone" name="phone" class="form-control" placeholder="Phone">
</div>
<div class="form-group">
    <input type="text" id="subject" name="subject" class="form-control" placeholder="Subject" required>
</div>
<div class="form-group">
    <textarea name="message" id="message" cols="30" rows="7" class="form-control" placeholder="Message" required></textarea>
</div>
<div class="form-group">
    <input type="submit" id ="submit" value="Send Message" class="btn btn-primary py-3 px-5">
</div>
</div>

<script type="text/javascript">
$(document).ready(function () {
    $("#submit").on("click", function() {  
        //alert();
        var name = $('#name').val();
        var email = $("#email").val();
        var phone = $("#phone").val();
        var subject = $("#subject").val();
        var message = $("#message").val();
        var model =
        {
            name: name,
            email: email,
            phone: phone,
            subject:subject,
            message:message
        };
        $.ajax({
            url: "URL",
            type: "POST",
            data: model,
            dataType: 'json',
            contentType: false,
            processData: false,
            enctype:'multipart/form-data',             
            success: function (data) {
                if(data == "1"){
                    alert("success sent message");
                }
                if(data == "0"){
                    alert("you alread sent message before");
                }
            },
            error: function (jqXHR, textStatus, errorMessage) {
                   console.log(errorMessage);
            }
        });
    })
});
</script>