Issue
Unable to Schedule Reports for Single Score Report types
Release
All releases.
Cause
This is because the Calendar, Map and Single Score reports are not supported for automatic emailing. Refer below documentation:
https://docs.servicenow.com/csh?topicname=schedule-report.html&version=latest
Multi-level pivot report type is not supported to run as a scheduled report unless the plugin - Webkit HTML to PDF (com.snc.whtp) is activated.
Resolution
Use a Speedometer or a Dial type report which can be run as a scheduled report.