In MIcrosoft Graph Connectors, it should be possible to have item level security on the search results regardless of the connector and regardless of the connector authentication by mapping identities...
BrianTJackett
Microsoft
MicrosoftCan you give more details around this request? Graph connectors support item level permissions currently through the Access Control List (ACL) that is defined during ingestion of items. Currently only Azure AD users, Azure AD groups, and external groups (custom definition by the connection author) are supported. Reference: Create, update, and delete items - Access Control List