"Not Found" when proxy passing website

Hi! I have my Netlify website set up with the domain fizyka.edushell.net and it all displays correctly.
However, I want the content of the site to be visible on edushell.net/fizyka. In order to do this I wrote the NGINX configuration file with proxy_pass which works correctly as tested on other sites, however when directed at fizyka.edushell.net instead of displaying the site it displays “Not Found”. Do you know how to fix this? I attach part of the nginx config:

    # reverse proxy
    location /fizyka/ {
            proxy_pass https://fizyka.edushell.net/;
            proxy_http_version      1.1;
            proxy_cache_bypass      $http_upgrade;
            proxy_set_header Upgrade                        $http_upgrade;
            proxy_set_header Connection "upgrade";
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP                      $remote_addr;
            proxy_set_header X-Forwarded-For        $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto      $scheme;
            proxy_set_header X-Forwarded-Host       $host;
            proxy_set_header X-Forwarded-Port       $server_port;

We do not support being proxy’d to.

Sorry I don’t have better news for you today!