Single logout failure with SAML

When the Appian system is embeded to another system, we use the SAML to do the login function. When the user logout, and change another user to login the system, Appian still use the old session, and it can not be logout. So how can I logout the Appian system.

I found a way to resolve this issue https://community.appian.com/support/w/kb/370/kb-1153-saml-authentication-faq, 

I have noticed that logging out of my IdP does not end my session in Appian. How can I configure this to end my session in Appian too?

 

When logging out of the IdP, it is necessary for the IdP to then send a valid logout request to Appian. Once Appian receives a valid logout request from the IdP, Appian will terminate the user's session.

In this way how do I send a valid logout request to Appian?

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