Can't append ip address to "GET" url

Everything gets appended to the url except for the ip address. The end of the url should look like this for example; ip=127.0.0.1. But the ip address is not being added. Any ideas? Budget is $10.

Here is the code...

<!-- User-Agent IP Code -->
<script type="application/javascript">
function getIP(json) {
$.get( "https://hook.us1.make.com/s86ki3rt515ieg1gr3f9xxc5ufdu59zb?" +location.search.substring(1), "user=" + navigator.userAgent, "ip=" + json.ip);
}
</script>
<script type="application/javascript" src="https://api.ipify.org?format=jsonp&callback=getIP"></script>
<!-- User-Agent IP Code -->