Nginx www.domain.com works but domain.com does not with nginx

This is my configuration file

server {
    listen 80;
    server_name www.example.tech example.tech;


    location = /favicon.ico { access_log off; log_not_found off; }
    location /static/ {
        root /home/usr/allioproj;
    }

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

I have already added A record for for www and @

When I try to open www.example.com it opens but when I open example.com is does not respond