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The plugin is displaying this error on page=crontrol_admin_manage_page:
There was a problem spawning a call to the WP-Cron system on your site. This means WP-Cron events on your site may not work. The problem was:
Unexpected HTTP response code: 503
I just spent an hour on the phone with my webhost, and they say cron processes are running on the site. They suggested that the error may be with the plugin.
Have you tested it with WP 5.2?