AJAX Post to AWS API Gateway not working (405 Method not allowed), but its working with Postman

Question

I built a small HTML form with bootstrap and I'm hosting it as a static Website in an AWS S3 Bucket. Then I added an AWS API Gateway and Lamda function so that the data from this form is stored into an AWS DynamoDB.

At this point, I can "Post" raw JSON Data via Postman to the API Gateway and the Lambda function is storing the data in the DynamoDB table. I created a .ajax in my Website to gather the data and send it as JSON. But I always get this error:

My AJAX:

$(document).ready(function(){
$("#form>button[type=submit]").click(function(event){
    event.preventDefault();

    let apiGatewayInvokeURL = 'https://gxt8igxck7.execute-api.eu-central-1.amazonaws.com/dev/test';
    
    var body = {
    KundenID : $("#KundenID").val(), 
    Vorname : $("#Vorname").val(), 
    Nachname : $("#Nachname").val(),
    Telefonnummer : $("#Telefonnummer").val(),
    Email : $("#Email").val(),
    Strasse : $("#Strasse").val(),
    Hausnummer : $("#Hausnummer").val(),
    PLZ : $("#PLZ").val(),
    Ort : $("#Ort").val(),
    Ankunftszeit : $("#Ankunftszeit").val(),
    Abreisezeit : $("#Abreisezeit").val(),
    datencheck : $("#datencheck").val() 
    };

    $.ajax({
        type: 'POST',
        url : apiGatewayInvokeURL,
        crossDomain: 'true',
        contentType: 'application/json; charset=utf-8',
        data: JSON.stringify(body),

        success: function () {
            $("#form").trigger('reset');
            alert('Successfull');
           },
        error: function (response) {
              alert('Failed: HTTP ' + response.status);
          }
          });  
       });
 });

I just can't seem to find the reason for this error. The API Gateway can clearly handle POST requests, but maybe I got the wrong idea about what I'm doing. If you need any further data just let me know.

Thanks in advance!

EDIT

Here is the Network Tab of Chrome while submitting:

It seems the Post request is going to the S3 Bucket Server instead of the API Gateway? And Content-Type of my Request Header is application/x-www-form-urlencoded, shouldn't it be application/json?

EDIT LAST

Found the Error.. apparently

$("#form>button[type=submit]").click(function(event)

was not working as intended. Because of this

event.preventDefault();

was not called correctly and the form natively POSTED to the Website HOST which is S3 Bucket and is not allowing POST Requests. I changed the Code to

    $("#btn").click(function(event){
    event.preventDefault();

Now it's working like a charm after fixing some minor CORS errors. Maybe this helps someone