!!! Overview
[{$pagename}] [OpenID Connect Discovery] entry which is [OPTIONAL] [Boolean] value specifying whether the [OpenID Connect Provider] supports [OpenID Connect Back-Channel Logout], with [true] indicating support. If omitted, the default value is [false].

[OpenID Connect Provider] [SHOULD] also register the [OpenID.Discovery] related metadata value [backchannel_logout_session_supported] 

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