Usually it's due to your input being incorrect on railway, try to use a DNS lookup tool like this one : https://dnschecker.org/all-dns-records-of-domain.php it might be helpful ! :)

Either way, DNS records rarely take that long to spread.

Your DNS records are correctly configured. The domain verification process had stalled, so we've re-triggered it. Your certificate should be issued and domain active within a few minutes.

Thanks for the fix. Can you help with this : payment decline - my bank, Zenith, says its from Railway's end.

Glad the domain is working! Regarding the card decline, that error is coming from your issuing bank (Zenith), not from us. We send the charge request and the bank decides whether to approve or reject it. Please try a different card, or contact Zenith to authorize the transaction.