Reset the Cron Schedules for Paid Memberships Pro. The single-use version can be found at: https://gist.github.com/sc0ttkclark/bd319a47656b786ccee3eca6f2dc4a9a

my-pmpro-reset-cron-schedules.php

<?php
/**
 * Reset the Cron Schedules for Paid Memberships Pro.
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

/**
 * Handle resetting the cron schedules for PMPro.
 */
function my_pmpro_reset_cron_schedules( $pre ) {
	pmpro_maybe_schedule_event( current_time( 'timestamp' ), 'hourly', 'pmpro_cron_expire_memberships' );
	pmpro_maybe_schedule_event( current_time( 'timestamp' ) + 1, 'hourly', 'pmpro_cron_expiration_warnings' );
	pmpro_maybe_schedule_event( current_time( 'timestamp' ), 'monthly', 'pmpro_cron_credit_card_expiring_warnings' );
	pmpro_maybe_schedule_event( strtotime( '10:30:00' ) - ( get_option( 'gmt_offset' ) * HOUR_IN_SECONDS ), 'daily', 'pmpro_cron_admin_activity_email' );

	return $pre;
}

add_filter( 'pre_get_ready_cron_jobs', 'my_pmpro_reset_cron_schedules' );