I submitted a previous ticket about the cron job. I am submitting a separate ticket per your request. 

I have contacted my hosting provider and they said they could not help me. I tried the set it up again in WP Control and it didn't work again.

This has gotten to a point where I had to hire someone to fix this problem because it is not working. They created a plugin so that the cron job will work as intended. Here is the code they created:

<?php

// Exit if accessed directly
if (!defined('ABSPATH')) {
    exit;
}

// Schedule the cron job
function appointment_reminder_schedule_cron() {
    if (!wp_next_scheduled('appointment_reminder_cron_job')) {
        wp_schedule_event(time(), 'appointment_reminder_interval', 'appointment_reminder_cron_job');
    }
}
register_activation_hook(__FILE__, 'appointment_reminder_schedule_cron');

// Clear the cron job on plugin deactivation
function appointment_reminder_clear_cron() {
    $timestamp = wp_next_scheduled('appointment_reminder_cron_job');
    wp_unschedule_event($timestamp, 'appointment_reminder_cron_job');
}
register_deactivation_hook(__FILE__, 'appointment_reminder_clear_cron');

// Add custom interval
function appointment_reminder_custom_cron_schedule($schedules) {
    $schedules['appointment_reminder_interval'] = array(
        'interval' => 5 * 60,
        'display'  => __('Every 5 Minutes'),
    );
    return $schedules;
}
add_filter('cron_schedules', 'appointment_reminder_custom_cron_schedule');

// Cron job function
function appointment_reminder_cron_function() {
    $url = 'https://{{website}}.com/wp-admin/admin-ajax.php?action=wpamelia_api&call=/notifications/scheduled/send';
    wp_remote_get($url);
}
add_action('appointment_reminder_cron_job', 'appointment_reminder_cron_function');

// Add author link
add_filter('plugin_row_meta', 'appointment_reminder_plugin_row_meta', 10, 2);
function appointment_reminder_plugin_row_meta($links, $file) {
    if (plugin_basename(__FILE__) === $file) {
        $author_link = 'Author';
        $links[] = $author_link;
    }
    return $links;
}

This is what they have so far, but would like feedback.

I changed the url to not have my website, but it has it in the plugin.

Also, this is something that I have had to deal with before. I agree with the comment in this thread (https://wordpress.org/support/topic/need-to-create-command-cron-for-automatic-notifications-with-amelia/) that maybe this is something you all should have built in. I don't use any other scheduling plugins, so I do not know what is standard practice. However, I would imagine that you get a lot of tickets and questions about the cron scheduling that you have users create.

I do not know what it would take to add it from your end, but I would imagine the work you need to build the cron into your plugin would save all the time you have put in to helping people deal with it. The plugin has been incredible and I really do like it. I even wrote you all a 5 star review, but this has been very difficult for me and I have spent many hours trying to get this resolved with many different people.

I hope we can figure something out.

Thank you again for the great plugin that has helped my business grow and saved me a lot of time scheduling.

I added this comment to the feature request. I really hope you do this!

I am not sure what other plugins do, but it seems like this is not something that other scheduling plugins require.

For example: https://support.vcita.com/hc/en-us
https://support.vcita.com/hc/en-us/articles/360041604393-Setting-Your-Booking-Reminders-and-Intake-Form
https://support.vcita.com/hc/en-us/articles/360041409013-Automatic-Client-Messages

I searced their documentation for “cron” and nothing came up.

Surely there are several other plugins that do not require users to do this. Just download the plugins of your competitors and see how they do it.

I have had to hire someone to solve my problem and it is frustrating. I love this plugin, but this feature has caused my so much trouble.

I really hope you add this feature