Heartbeat error message for Appointment plugin - latest version

Why am I getting this message "There seems to be something wrong with the WP Heartbeat API state. The "Pending Appointments count notification" add-on might not work properly because of this."

I was getting on the older site installed on an Azure Hosting, I just migrated and updated the plugin...testing before we switch DNS....this error message is not telling me anything . We had the Appointments plugin not working correctly on azure and attributed that message to the Host...now were on WPE and still getting this.....WHY?