Dns can change up to 24-48h to update, id reccomend using cloudflare nameservers, but thats just a preference. makes it easier with the railway cloudflare integration.

The fix is in here https://station.railway.com/questions/custom-domain-txt-file-not-being-recogni-a1b2633c

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I just figured this out. Namecheap automatically appends the domain name. Just enter _railway-verify in the host field.

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Your domain now has a valid certificate and is working. DNS can sometimes take 24-48 hours to fully propagate. Feel free to reopen if you need anything else.