404 nginx error

Change the line in the location block to:

try_files $uri $uri/ /index.php?q=$uri&$args;

and reload nginx

sudo systemctl reload nginx

All should be well :)

if reactjs

location ~ [^/]\.php(/|$) {

            fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;

            if (!-f $document_root$fastcgi_script_name) {

                return  404;

            }

}