Cloudflare pending nameserver update

cloudflare site still pending nameserver update even after update to cloudflare dns server at domain registrar after 48 hours. what is the problem?
thank you.

What is your domain?

domain is globalpublishing.com.sg

I am also having problem with .it domain. I check NS records using online services providing DNS lookup services and I can see that the NS has already changed for Cloudflare one. Though in the dashboard it says its still awaiting verification.

EDIT:
However, when I used the https://lookup.icann.org that is linked on the Cloudflare Dashboard it does not provide any results. All it says is:

No registry RDAP server was identified for this domain. Attempting lookup using WHOIS service.

Failed to perform lookup using WHOIS service: TLD_NOT_SUPPORTED

Is cloudflare using icann.org for DNS lookup? Could that be a reason why my cloudflare domain is not activated yet or you do not support .it (or .com.sg as in original question) domains at all?