Error 1016 Origin DNS error when it works on an identical subdomain

I’m trying to serve a static site (built with VueJS) on my Ubuntu 20 server using nginx as a proxy and linked to my domain via nginx.

I’m trying to use It works on which is set up identically in cloudflare & nginx.

I have done this plenty of times before with no issues.

Nginx config:

        root /home/ubuntu/Websites/Portfolio;

        location / {
          try_files $uri $uri/ /index.html;

        listen 80; # managed by Certbot


I’m not sure why this won’t work as “dev.” and “@” both have identical A records

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