Error: www subdomain does not support HTTPS

The Nginx server hosting both the mfoda-eg.com main domain and the Discuss.mfoda-eg.com subdomain of the website. It can be with two certificates or one, one for the main domain and one for the subdomain. Configuration both server blocks, and all requests are working fine: https://mfoda-eg.com/ will be redirected to https://mfoda-eg.com/ and https://discuss.mfoda-eg.com / stays Only on HTTP.


lmlm

 server {
  listen      80 default_server;
  server_name  _;
  return 444;
}

server {
  listen       443 ssl default_server;
  server_name  _;
  ssl_certificate      /etc/nginx/cert/discuss.mfoda-eg.pem;
  ssl_certificate_key  /etc/nginx/cert/discuss.mfoda-eg.key;
  return 444;
}

Run command :
$ sudo nginx -t
And command :
$ sudo service nginx restart
Good by my Frinds