javascript - Getting post data from ajax request php

I keep getting null values with the below code:

Ajax request:

formData = {
            u: "3959eeadb32e02b85a792e21c",
            id: "6d7613df26"
        };
        $.ajax({
            url: "/includes/loginProcess.php",
            type: "POST",
            crossDomain: true,
            contentType: 'application/json',
            data: formData,
            dataType: "json",
            success: function(data) {
                console.log(data);
            },
            error: function() {
                
            }
        });
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PHP Processing:

$data = array();
    $data['u'] = $_POST["u"];
    
    $data['id'] = $_POST["id"];
    echo json_encode($data); 
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{u: null, id: null} is logged in the success function. Any ideas?

This is on an AWS Lightsail instance BTW... is there some server config I'm missing maybe?

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