nginx reverse proxy. How to raise a 4th level domain?

Question

Nginx

Hello!
There is a domain - itmust.ru
A third-level domain is created on it - test.itmust.ru
There is a server with proxmox, and one external ip address.
The task is to set up several 4th-level domains for testing with a redirect to proxmox host virtual machines (via http), for example: Site1.test.itmust.ru
>> 192.168.89.171
Site2.test.itmust.ru >> 192.168.89.172
they were accessible from outside.
For the test, I installed a clean debian host, set up nginx on it, sort of like, set up a reverse proxy.
But it doesn't work, not site1.test.itmust.ru, not site2......
What's wrong?
Here is the nginx config:

user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
  worker_connections 768;
  # multi_accept on;
}

http {

server{
listen 80;
server_name site2.test.itmust.ru;
location / {
proxy_pass http://192.168.89.172:80;
#proxy_set_header Host $http_host;
}
}
server{
listen 80;
server_name site1.test.itmust.ru;
location / {
proxy_pass http://192.168.89.171:80;
#proxy_set_header Host $http_host;
}
}

  ##
  # Basic Settings
  ##

  sendfile on;
  tcp_nopush on;
  tcp_nodelay on;
  keepalive_timeout 65;
  types_hash_max_size 2048;
  # server_tokens off;

  # server_names_hash_bucket_size 64;
  # server_name_in_redirect off;

  include /etc/nginx/mime.types;
  default_type application/octet-stream;

  ##
  # SSL Settings
  ##

  ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
  ssl_prefer_server_ciphers on;

  ##
  # Logging Settings
  ##

  access_log /var/log/nginx/access.log;
  error_log /var/log/nginx/error.log;

  ##
  # Gzip Settings
  ##

  gzip on;
  gzip_disable "msie6";

  # gzip_vary on;
  # gzip_proxied any;
  # gzip_comp_level 6;
  # gzip_buffers 16 8k;
  # gzip_http_version 1.1;
  # gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

  ##
  # Virtual Host Configs
  ##

  include /etc/nginx/conf.d/*.conf;
  include /etc/nginx/sites-enabled/*;
}

Answer 1

First you need to register these domain names in your DNS or create a wildcard record.