C# MVC Saml2 not clear idp user token after sign out

Questions SAML
1

I am using Sustainsys.Saml2.Owin to implement SSO login.
when I logout,It can’t open login page,but relogin my app.
can I clear idp saml2 user session token after sign out
like below
Claim userClaim =ClaimsPrincipal.Current.FindFirst(“http://schemas.microsoft.com/identity/claims/objectidentifier”);
if (userClaim != null)
{
string userObjectID = userClaim.Value;
AuthenticationContext authContext = new AuthenticationContext(authority, new NaiveSessionCache(userObjectID));
authContext.TokenCache.Clear();
}