Logto needs client_id to validate the post_logout_redirect_uri and auto-redirect back to the app. Without it, user gets stuck on Logto's end-session success page. Note: post_logout_redirect_uri must be registered in Logto Console under the app's "Post sign-out redirect URIs". Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>