Primary nameserver cannot be resolved

Been using Virtualmin with an Ubuntu 14.04 VPS from a few years now but wanted to give Centos a try so I moved my sites to a new server and reinstalled a new OS (Centos 7 minimal) on my current server. Then I:

1. Downloaded Virtualmin installer file using:

   wget http://software.virtualmin.com/gpl/scripts/install.sh -O /root/virtualmin-install.sh

2. Inititated the installer using:

   sh /root/virtualmin-install.sh

Problem:

a. During the installation, I got two errors. One regarding "Disk Quotas" and another regarding "Primary Network Interface" where I input "venet0".

b. In the Post-Installation Wizard, I kept getting the error Primary nameserver cannot be resolved from the rest of the Internet : Host abc.xyz.com not found: 3(NXDOMAIN) even after I've tried reinstalling the OS and trying step 1 and step 2 again. I could just skip the check but I want to resolve this issue before proceeding further. What should I do to fix this?

I bought the xyz.com in godaddy and the dns records are as follows:

A @ xxx.xxx.xxx.xxx 600 seconds

CNAME www @ 1 Hour

CNAME  _domainconnect _domainconnect.gd.domaincontrol.com 1 Hour

NS @ ns69.domaincontrol.com 1 Hour

NS @ ns70.domaincontrol.com 1 Hour

SOA @ Primary nameserver: ns69.domaincontrol.com 1 Hour`

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N.B. Runninghostname -f returns abc.xyz.com as expected.

abc is the hostname.

xyz.com is the domain name pointed to the VPS.

xxx.xxx.xxx.xxx is the IP Address of the VPS.