.in-addr.arpa. not found: 3(NXDOMAIN)

I have been struggling with this for about 3 days now. I will continue to work on it as I wait for anyone to help but I'm having the following problem. I will use examples in this post to mask the domains and IPs somewhat. This is not to make more work for you I just don't want it easily cached in search results on google etc. Thank you in advance for any help

I have installed WHM on a Cloudlinux system hosted on a VM using VMWare. The domain(In this case lets call it domain.co.za) was used as the hostname of the system and if you go to that domain it actually loads. That domain name is pointing to Cloudflare which in turn points back A records to the WHM server as the nameservers i would like to use. This system is currently using PowerDNS as well

Now what I also have encountered is that the ns1.domain.co.za is working fine(This is also the machines hostname) but the ns2.domain.co.za is not

If I try to set nameservers for any other domains it does not allow me to change them and they are giving the following errors

Authoritative Nameserver failure for domain

This I am assuming is because of the following error when I use intoDNS to check what the problem is(this is not for domain.co.za this is for a domain I own called orginc.co.za which only the ns1.domain.co.za is accepted and not ns2.domain.co.za)

The following nameservers are listed at your nameservers as nameservers for your domain, but are not listed at the parent nameservers

When I use a dig command I get the following results for ns2(Please note actual IPs changed)

Host 20.20.20.164.in-addr.arpa. not found: 3(NXDOMAIN)
[root@ns1 ~]# dig ns2.domain.co.za

; <<>> DiG 9.11.4-P2-RedHat-9.11.4-26.P2.el7_9.3 <<>> ns2.domain.co.za
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 61082
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
;; WARNING: recursion requested but not available

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 4096
;; QUESTION SECTION:
;ns2.domain.co.za.                IN      A

;; Query time: 0 msec
;; SERVER: 164.20.20.20#53(164.20.20.20)
;; WHEN: Sat Feb 13 12:11:12 SAST 2021
;; MSG SIZE  rcvd: 51

I have been reading around and it seems like the general consensus is that it is a reverse DNS issue but I'm not sure how to proceed. I get answers like the following that I found on a cPanel forum

This functionality only works if your data center has delegated permission to your server to control the entry

But at the end of the day, we own the physical hardware that we put in at the data center.

I do not know how to proceed at the moment but will keep trying in the meantime

Ok everyone so the sequence of events went as follows.

1. List item There was an A record mismatch on WHM itself as ns2.iclixhosting.co.za was not set in the iclixhosting.co.za zones
2. Reverse DNS had to then propagate
3. We then had a firewall issue that needed a bypass for port 53 on that IP

In other words for future people reading this answer make sure of the above-mentioned items if you have problems similar to this