Frontchannel_logout_session_supported is defined in OpenID Connect Front-Channel Logout as a OPTIONAL Boolean value specifying whether the OpenID Connect Provider can pass iss (issuer) and sid (session ID) query parameters to identify the Relying Party session with the OpenID Connect Provider when the frontchannel_logout_uri is used.

If supported, the sid Claim is also included in Id_tokens issued by the OpenID Connect Provider. If omitted, the default value is false.

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