you set the domain up incorrectly.

you will need to use cloudflare's nameservers.

they have a guide for that here -

domain is bought on godaddy. so I need to move it to cloudflare?

you need to use Cloudflare's nameservers, please follow the guide I linked

I 've done it, but still see the same error\

dig NS mydomain @1.1.1.1 shows cloudflare NS

you would need to re-do the domain setup now, remove the domain from railway and cloudflare and re-add it

and then you will need this docs section -

Why I need remove and add it to cloudflare again? I Added it 30min ago?

you did it incorrectly the first time

hmm, what is wrong, I'll do it again in the same way

ok, it works now without any additional changes. Thanks for instructions

no problem!

!s