I have requested my own tenant of QA landscape SAP Cloud Identity (https://nlp-cloud.accounts400.ondemand.com/), and I am trying to integrate with it to my own SP application, I can do the SSO process sucessfully, but fail to do SLO, and I always get a SAML response saying "Identity Provider could not process the logout message received." when my SP application send a SLO request to this IdP.

Here is my SP SAML configuration:

Please check the chrome HAR file to get the all the HTTP requests and responses in https://toolbox.googleapps.com/apps/har_analyzer/

105882198har.txt

Can someone help me? Thanks a lot.