Can you please share some ss showing the CNAME and the value provided by railway & where you added in namecheap?

I ran into this as well. Namecheap specifically needs a slightly different formatted TXT field. instead of _railway-verify.dyehype.com, put in _railway-verify . namecheap auto-appends the domain name.

If we use Namecheap you can use the way that @snugglepilot mentioned above. For me, to avoid this issue, I set up cloudflare with namecheap first by adding cloudflare dns to namecheap, and then using one-click DNS setup with cloudflare
I found this way is very simple and you don't have to worry any mistake when you setup with this.
Hope railway can have one-click DNS setup to namecheap in the future.

Thanks for all the answers. I already changed from _railway-verify.dyehype.com to only _railway-verify, then the status changed to "Validating domain ownership", can't remember what it was before.
But also railway by now shows only _railway-verify.
and i don't have the cloudflare connect button.

namecheap:

By now it shows a green checkmark for the TXT record as well. But on https://www.dyehype.com browser still shows "The website is not available"

You added the record for dehype.com.

For www.dehype.com, you need to add one more domain in railway. It would give you a CNAME records which you need to add in namecheap

Note - website.come & www.website.com are considered as separate domains

Thanks a lot! Works now (:

Greatt, happy building