Subdomain - can preview but not access on web

Support and Discussion Web Server
1

I have created a subdomain with its folder placed and /public_html like so:
/public_html/sub.site.com

If I go to /websites/site.com/sub.site.com on CyberPanel, and click on Preview, it will correctly show the index.html content under /public_html/sub.site.com.

But if I attempt to access it directly at sub.site.com it will show:

We can’t connect to the server at sub.site.com.

I can access the main domain just fine.

2

Note that I did not make any changes to DNS/A records

3

Well, it was the DNS records in the end. I followed instructions in this video, which suited me well as my domain as at GoDaddy.