Server IP address could not be found using a subdomain. NS, A and AAAA DNS records set up like my primary domain, but subdomain doesnt work.
https://i.imgur.com/mbsJ8XT.png <- My DNS entries. I don't see what's wrong or different, so any help would be greatly appreciated.
You don't need to setup NS records for subdomains. You can remove them.
Did you setup DO nameservers at your domain registrar?