Ordinary Sign out cleared only the QQQ session; the provider session left in the browser silently signed the same person back in (prompt=login alone was already observed reusing retained SSO on real Authentik). Sign out now runs the provider end-session flow when the server supports it, and every sign-in also sends max_age=0. Stored-session restore after sign-out was checked: not a cause. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>