JQUERY sortable不会调用php函数

Question

So, I'm using Jquery to make 4 lists to be sortable between themselves, and up to the visual part, it works great, I can even receive their data-attributes, but I can't seem to call the PHP function on the RECEIVE event of the sortable lists.

I've tried a few times to call it differently, using other methods, but nothing seems to work.

<?php

require_once '../../DAO/model.php';

$id = $_POST['id'];
$week = $_POST['week'];

$query = "UPDATE onboarding_checklist_week 
SET week = '$week'
 WHERE id = 'id'";
mysqli_query($conn, $query) or die (mysqli_error($query));

 ?>

DAO/MODEL is my connection with SQL, it works just fine for the entire project, but as far as I can see, it's not even calling the PHP function, so it's not some connection problem.

$(document).ready(function() {

$('#1').sortable({
    cancel: ".collapsible-header",
    connectWith: '#2, #3, #4, #5',
    receive: function (event,ui) {
        var id = ui.item.attr('data-identifier');
        var week = '1';
        $.ajax({
            url: 'changeEvents.ajax.php',
            type: 'POST',
            data: {
                'idTask' : id,
                'week': week
            }
        });
    }

});


$('#2').sortable({
    cancel: ".collapsible-header",
    connectWith: '#1, #3, #4, #5',
    receive: function (event,ui) {
        var id = ui.item.attr('data-identifier');
        var week = '2';
        $.ajax({
            url: "changeEvents.ajax.php",
            type: "POST",
            data: {
                'idTask' : id,
                'week': week
            }
        });
        console.log('funcionou');
    }

});

It repeats three more times, one for each table.

It should be working, but it's not, doesn't matter how many times I move the elements around, it won't call my php function.

if I use console.log('id'), for example, I seem to be receiving the id of the elements just fine.