This object reports which authentication method, such as a local database, RADIUS, TACACS+, or certificate-based authentication, was used to verify this specific remote-access session's user before the session was allowed to establish. It matters for security auditing and troubleshooting: if an organization has moved to enforce a stronger centralized authentication method, this field lets an admin spot any sessions that slipped through via a weaker or deprecated method still configured as a fallback. Seeing a session report a local-database authentication method when the organization believes all remote access now requires RADIUS-based MFA would be a real security gap worth immediate investigation.