Authorization issue (html 500)

[Tom-De-Backer]

I am trying to call OpenAi in a test website for future projects, but encountered a problem.

On my website I have a button and output field.
when clicking on the button the following code is executed via js:
` <script>
console.log("hello");
window.onload = function() {
document.getElementById("submit-request").addEventListener("click", function() {
var prompt = document.getElementById("prompt-input").value;
var xhr = new XMLHttpRequest();

        xhr.open("GET", "/wp-admin/admin-ajax.php?action=make_request, true);

        xhr.onreadystatechange = function() {
            if (xhr.readyState === 4 && xhr.status === 200) {
                var response = JSON.parse(xhr.responseText);
                document.getElementById("response-output").innerHTML = JSON.stringify(response);
            }
    };
    xhr.send();
});

}
</script>`

The PHP function that is behind the "make_request" is the following:
`
add_action( 'wp_ajax_make_request', 'make_request' );
add_action( 'wp_ajax_nopriv_make_request', 'make_request' );

function make_request() {

$client = OpenAI::client('sk-xxx');

$result = $client->completions()->create([
'model' => 'text-davinci-003',
'prompt' => 'PHP is',
'max_tokens' => 6
]);

echo $result['choices'][0]['text'];

wp_die();
}`

As you can see it is just the basic example from the Readme for the moment. The API key is removed for obvious reasons.
This is the error I got in the webbrowser console:
"GET https://xx.host.com/wp-admin/admin-ajax.php?action=make_request&prompt=kn 500"

What is the problem. Is there some extra authorisation I should do for Openai-php/client?