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Openstack instance dns issue

Hello,

I am having some issues with DNS.

I am using OpenStack Stein. I launched two instances and installed Plesk on one instance and Virtualmin on another instance. The problem is I cannot able to ping or dig the nameservers of each instance domain from outside. The IP address is unable to resolve the name. But if I dig from Virtualmin to Plesk domain nameserver than I get a response with IPs and nameserver but if I do the same thing from outside(from my home computer) I cannot able to get an IP address

This is from my computer:

; <<>> DiG 9.11.3-1ubuntu1.8-Ubuntu <<>

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 37104

;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 65494

;; QUESTION SECTION:

;[domain]. IN A

;; Query time: 247 msec

;; SERVER: 127.0.0.53#53(127.0.0.53)

;; WHEN: Sat Oct 12 00:48:22 IST 2019

;; MSG SIZE rcvd: 44

and this is from Virtualmin instance to Plesk domain nameserver

; <<>> DiG 9.11.4-P2-RedHat-9.11.4-9.P2.el7 <<>>

;; global options: +cmd

;; Got answer:

;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23223

;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 3

;; OPT PSEUDOSECTION:

; EDNS: version: 0, flags:; udp: 4096

;; QUESTION SECTION:

;[domain] IN A

;; ANSWER SECTION:

[domain]. 3600 IN A [IP]

;; AUTHORITY SECTION:

[domain]. 143111 IN NS ns1.[domain].

[domain]. 143111 IN NS ns2.[domain].

;; ADDITIONAL SECTION:

ns2.[domain]. 143111 IN A [IP]

ns1.[domain]. 143111 IN A [IP]

;; Query time: 14 msec

;; SERVER: 127.0.0.1#53(127.0.0.1)

;; WHEN: Fri Oct 11 18:25:18 UTC 2019

;; MSG SIZE rcvd: 128

In Plesk instance, named-chroot.service is active and running.

In Virtualmin instance, named.service is active and running.

Please help me with it.

Thank you so much in advance.