Both domains are verified with valid certificates, and traffic is reaching your service through Cloudflare successfully. The DNS_PROBE_FINISHED_NXDOMAIN error is a DNS resolution failure on the client side, not a Railway or domain configuration issue. Try flushing your local DNS cache (on Windows: run ipconfig /flushdns in Command Prompt), then reload the page. If it still fails, try a different network (e.g. mobile data instead of Wi-Fi) to confirm whether your current network's DNS resolver is the cause.