Configured an email listener as an ExportEmailAsXml listener. It is checking and processing emails (email objects being created in HEATSM) but no XML file is being created in the configured XML export folder. Found an error in the EmailService logs showing "The given path's format is not supported".
This issue is caused by the Login URL for the tenant in the ConfigDb containing more than the Server Name or Fully Qualified Domain name. The Login URL should only show the Fully Qualified Domain Name or ServerName with no extraneous information.
Once the Login URL was changed to hold only the FQDN and the email service was restarted the XML files started exporting as expected.