Nameservers on domains purchased through us cannot be changed - there is no mechanism for this on our side, so we're unable to point them at Cloudflare or any other third-party nameserver.

If you need the domain on Cloudflare's nameservers, the path forward is transferring the domain out to Cloudflare Registrar. Note that ICANN imposes a 60-day transfer lock on newly registered domains, so the transfer can proceed only after 60 days have passed since you originally purchased azyinvoicer.com.

Thank you Brody for the fast reply. I was researching online yesterday and there was a Railway blog post that stated requests could be placed to change nameservers (if I'm not mistaken. If i could find it again i will link it in the thread). But since you are saying it is something that is not supported is this going to be supported soon if so how soon possibly? Otherwise I would need to look at a possible refund or transfer of the domain elsewhere. Thank you!

Could you share the blog post you're referring to? We'd like to take a look at it. To set expectations, there are no plans to support nameserver changes on Railway-purchased domains. If you need Cloudflare's nameservers, transferring the domain out once the 60-day ICANN lock has passed is the way to go.