Expire posts to draft using a datepicker field in ACF

functions.php

// Expire events
if ($expireTransient = get_transient($post->ID) === false) {
	set_transient($post->ID, 'set for 1 minutes', 1 * MINUTE_IN_SECONDS );
	$today = date('Y-m-d H:i:s', current_time('timestamp', 0));
	$args = array(
		'post_type' => 'events',
		'posts_per_page' => 200,
		'post_status' => 'publish',
		'meta_query' => array(
			array(
				'key' => 'end_date_time',
				'value' => $today,
				'compare' => '<='
			)
		)
	);
	$posts = get_posts($args);
	foreach( $posts as $post ) {
		if(get_field('end_date_time', $post->ID)) {
			$postdata = array(
				'ID' => $post->ID,
				'post_status' => 'draft'
			);
			wp_update_post($postdata);
		}
	}
}

Thank you for this code, I use it often. Most of my sites I host on Siteground and have no issue, but for some reason this will not work on AWS Lightsail or EC2. Would you have any advice or idea why that might be?