Set logged-out view as failure_path for saml

config/packages/security.php

@@ -193,6 +193,7 @@ return static function (ContainerConfigurator $containerConfig) {
                 // Use the attribute's friendlyName instead of the name
                 'check_path' => 'saml_acs',
                 'login_path' => 'saml_login',
+                'failure_path' => 'logged-out',
                 'always_use_default_target_path' => true
             ],
             'logout' => [