claude.ai's custom-connector flow probes /.well-known/oauth-* during setup. The catch-all 301 -> /app/ made those return the Kitchen login page (200), so claude.ai mistook it for an OAuth sign-in service, tried Dynamic Client Registration, and failed. Returning 404 makes it treat the server as authless and connect. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>