I tried to set up an Nginx reverse proxy, but for some reason, only one server definition is running.

This is my nginx config:

#user  nobody;
worker_processes  1;

#error_log  logs/error.log;
#error_log  logs/error.log  notice;
#error_log  logs/error.log  info;

#pid        logs/nginx.pid;


events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;
    server_names_hash_bucket_size  64;

    #log_format  main  '$remote_addr - $remote_user [$time_local] "$request" '
    #                  '$status $body_bytes_sent "$http_referer" '
    #                  '"$http_user_agent" "$http_x_forwarded_for"';

    #access_log  logs/access.log  main;

    sendfile        on;
    #tcp_nopush     on;

    #keepalive_timeout  0;
    keepalive_timeout  65;

    #gzip  on;

    server {
        listen       80;
        listen       443 ssl http2;
        
        server_name  subdomain-one.domain.com;

        ssl_certificate     c:/.../fullchain.pem;
        ssl_certificate_key c:/.../privkey.pem;

        location /.well-known {
            root   certbot;
            index  index.html index.htm;
        }


        location / {
            proxy_pass http://localhost:5766;
            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-Host   $host;
            proxy_set_header    X-Forwarded-Server $host;
            proxy_set_header    X-Forwarded-Port   $server_port;
            proxy_set_header    X-Forwarded-Proto  $scheme;
            proxy_set_header    ssl-client-cert    $ssl_client_escaped_cert;
        }
       
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    } 

    server {
        listen       80;
        listen       443 ssl http2;
        server_name  subdomain-two.domain.com;

        ssl_certificate     c:/.../fullchain.pem;
        ssl_certificate_key c:/.../privkey.pem;

        location /.well-known {
            root   certbot;
            index  index.html index.htm;
        }


        location / {
            proxy_pass http://localhost:5766;
            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-Host   $host;
            proxy_set_header    X-Forwarded-Server $host;
            proxy_set_header    X-Forwarded-Port   $server_port;
            proxy_set_header    X-Forwarded-Proto  $scheme;
            proxy_set_header    ssl-client-cert    $ssl_client_escaped_cert;
        }
       
        error_page   500 502 503 504  /50x.html;
        location = /50x.html {
            root   html;
        }
    }
}

subdomain-two.domain.com is the working one. I have no idea why the other is not working. I copied the working definition and just changed the server name. Furthermore, I have changed the positions of the definitions.