How to set up a subdomain for nginx?

Question

Nginx

server {
        listen 80;
        root /srv/s.3op.space;
server_name example.com;
        index index.php

        location / {
                try_files $uri $uri/ =404;
        }

        location ~ \.php$ {
                include snippets/fastcgi-php.conf;
                fastcgi_pass unix:/var/run/php/php7.2-fpm.sock;
        }

        location ~ /\.ht {
                deny all;
        }
}

Answer 1

I would check all the same in the NGINX logs what path is requested, what is returned 404.
Maybe there really is no path to the file.
root /srv/s.3op.space/public; this one, for example, or the index file in it.

Answer 2

The problem resolved itself. When requesting the s.3op.space path, the 404 page of the host was returned, not nginx, which probably had problems.