How to use CaptchaConfiguration hook in WHMCS?

[Bodes]

Is there actually a way to hook into CaptchaConfiguration in WHCMS 8.11?

This doesn't ever log any activity:

<?php

add_hook('CaptchaConfiguration', 1, function($vars) {
    error_log("EDEBUG: CaptchaConfiguration fired. Vars: " . print_r($vars, true));
    logActivity("EDEBUG: CaptchaConfiguration fired.");
    return []; 
});

I'm trying to disable the Captcha for the user-invite-accept.tpl page only, which doesnt seem to be an option in settings.