Getting Problem While DNS Records Using CentOS Web Panel

Hello Comunity Members

I have bought a domain from Namecheap now trying to add my domain to my CentOS Web Panel using custom name servers. But every time I do I just get a domain can't be reached an error. I have used all the possible ways to add it, but unfortunately, it did not add.

Here are the steps i have already taken
I have already created the custom name servers with my domain provider.

I have tried using DigitalOceans NS and my custom ones.
Any help would be appreciated

you can use this site for live dns testing for your domain
http://leafdns.com/