There are two possible reasons why users are unable to access a report based on a custom report type created by an administrator. One is that the custom report type is in development mode, which means that it is not deployed and available for use by other users except for administrators and users with manage custom report types permission. The other is that the report is saved in a private folder, which means that it is visible only to its owner and not shared with other users or groups. References: https://hel p.salesforce.com/s/articleView?id=sf.reports_builder_custom_report_types.htm&type=5https://help.salesforce.com/s/articleView?id=sf.reports_builder_folders. htm&type=5