(see case 15058078)
Per all documentation, the purpose of the Reviewer role is to allow members to view and access case data in Advanced eDiscovery to which they have been assigned. However, a user assigned to the Reviewer role seems too much in the S&C Center.
Based on least permissions, a Reviewer should only be able to see their Threat management (Quarantine) and the eDiscovery menu showing their case(s). Instead, they can currently view:
Records Management (though empty)
Data Governance (read only)
Mail flow dashboard (though not populated due to error)
Data privacy (GDPR dashboard and Data subject requests)
Search (Content search - can view all content search information but not data)