Export Sync to Google, Outlook & Apple Calendar Stopped Working

I have multiple sites that use the plugin V3.0.0 that have worked successfully for 3 years. Recently all the sites where users subscribed and synced their calendars (Apple, Outlook & Google) have stopped receiving updates made via the All In One Event Calendar on the site.

See the site calendar in the URL below with the Subscribe button at the bottom, or open an individual event and use the Add to Calendar button. Has a change been made at the Time.ly site that impacts the Exporter?

The page I need help with: [log in to see the link]