Using Version 188.8.131.52, I am implementing an SP Initiated SLO using the example solution as a template. The logout response that I receive from the IdP (Okta) is indicating AuthnFailed. Am I supposed to be providing a signature with the LogoutRequest? If so, I don't see anything in the API that allows me to do so. InitiateSsoAsync seems to sign the AuthnRequest, whereas InitiateSloAsync does not sign the LogoutRequest. This is despite the fact that I have WantAssertionOrResponseSigned set to true in the SAML Configurations. Is there a way for me to sign the LogoutRequest that gets sent via InitiateSloAsync? Otherwise, is there anything else I should be looking at to figure out why I would get AuthnFailed as part of my LogoutResponse?