IP connection works but Domain returns 500

I was following through the tutorial https://www.digitalocean.com/community/tutorials/how-to-set-up-django-with-postgres-nginx-and-gunicorn-on-ubuntu-20-04 Everything worked fine until I decided to setup my Domain name that I bought few days ago. I am pointing to the digitalocean servers and I have added DNS records:

A www.balkan-ultra.com directs to 164.92.236.124	
A balkan-ultra.com directs to 164.92.236.124
NS balkan-ultra.com directs to ns3.digitalocean.com.
...

My Django allowed hosts: ['.ondigitalocean.app', '164.92.236.124', 'balkan-ultra.com', 'www.balkan-ultra.com']

nginx config:

server {
    listen 80;
    server_name balkan-ultra.com www.balkan-ultra.com;

    location = /favicon.ico { access_log off; log_not_found off; }

    location / {
        include proxy_params;
        proxy_pass http://unix:/run/gunicorn.sock;
    }
}

UFW is disabled

http://164.92.236.124:8000/ - Works fine http://164.92.236.124/ - Returns ‘Welcome to nginx!’ html www.balkan-ultra.com - Internal Server Error balkan-ultra.com - Internal Server Error