ACFE Button Ajax 400 error

Thanks, that was an issue, but only because when I copied over the code here I mistakenly didn’t change both action function names. I did however figure out the issue with the 400 error, it was that I was including the function only on the post.php edit page, it also needed to be included while doing ajax. (|| wp_doing_ajax()), and I am now getting a response.

I am now having issues with getting the response to the success callback.
Here is the code I have:

function acfe_buttons_ajax() {
	ob_start();
	echo 'Results';
	$result = ob_get_contents();
    ob_end_clean();
    return $result;
    wp_die();
}
add_action('wp_ajax_acfe/fields/button', 'acfe_buttons_ajax');
add_action('wp_ajax_nopriv_acfe/fields/button', 'acfe_buttons_ajax');

and:

acf.addAction('acfe/fields/button/ajax_success', function(response, $el){
		alert(response);
});

The js does the alert, but just alerts “0”. Any thoughts?

The .js is enqueued in functions.php like:

function agency_enqueue($hook) {
    if ( 'post.php' != $hook ) {
        return;
    }
    wp_enqueue_script( 'agency_js', get_stylesheet_directory_uri() . '/js/admin-agency.js', array('jquery'), null, true );
}
add_action( 'admin_enqueue_scripts', 'agency_enqueue' );