Are you using the root domain?

If so, you'll need to add the @ and www records, along with the TXT records prompted by railway.

Add these DNS records manually in your registrar:

1. CNAME — Name is "www", value is your Railway CNAME target
2. ALIAS or ANAME — Name is "@", value is your Railway CNAME target
3. TXT — Add exactly as shown in your Railway dashboard
4. Save and wait 15–30 minutes.

If you don't see ALIAS or ANAME as an option, use an A record with Railway's IP address instead.

Let me know if this helps or if any question.