Can't get SAML logout to work

I managed to perform a successful SAML login with Auth0. However, the logout remains a mystery to me.

The Auto0 logs states the following for the logout “No active session(s) found matching LogoutRequest”.

I’m using the same sessionIndex from the assertion for the logout.

And the nameID and nameFormat is also the same - this is also shown in the login/logout logs.

The audience setting is identical to the issuer in the Logout request.

Any idea?

Ok, when changing from a Redirect to a form POST, the logout works.