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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): Nextcloud Hub (23.0.3) (image: nextcloud)
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.04.4 LTS (Host)
Apache or nginx version (eg, Apache 2.4.25): nginx version: nginx/1.21.6 (image: “wilder/nginx-proxy”)
PHP version (eg, 7.4): PHP 8.0.17 (cli) (dentro del contenedor de nextcloud)
The issue you are facing:
Levanto el contenedor de NextCloud y el contenedor de BD sin problemas, entro a la url y se instala, pero por defecto no funcionan los archivos office (.docx, .xlsx, etc).
Para poder abrirlos estoy intentando activar la aplicación “Community Document Server” y luego “ONLYOFFICE”. Después de hacer esto en la opción de “Configuracion → ONLYOFFICE → url onlyoffice docs” aparece por defecto:
“dominio.cl”
Is this the first time you’ve seen this error? (Y/N): Yes
Steps to replicate it:
The output of your Nextcloud log in Admin > Logging:
Error onlyoffice OCP\Http\Client\LocalServerException: Host violates local access rules
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
{"reqId":"UQE9FcZnx4FBDmzAqCb0","level":2,"time":"2022-03-29T18:06:27+00:00","remoteAddr":"172.20.3.2","user":"usuario","app":"no app in context","method":"PUT","url":"/apps/onlyoffice/ajax/settings/address","message":"Host localhost was not connected to because it violates local access rules","userAgent":"Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.82 Safari/537.36","version":"23.0.3.2","id":"62434aa3af7fe"}
The output of your Apache/nginx/system log in /var/log/____:
<?php
$CONFIG = array (
'htaccess.RewriteBase' => '/',
'memcache.local' => '\\OC\\Memcache\\APCu',
'apps_paths' =>
array (
0 =>
array (
'path' => '/var/www/html/apps',
'url' => '/apps',
'writable' => false,
),
1 =>
array (
'path' => '/var/www/html/custom_apps',
'url' => '/custom_apps',
'writable' => true,
),
),
'instanceid' => 'ocy6kalhp2um',
'passwordsalt' => 'MgFiregF0q+e/VN6ScC2Vii/XP/T+z',
'secret' => 'cSe74RP4JfOMebECexcHa0WW+R+vt7o4fGJZwfGVY0XJRnXN',
'trusted_domains' =>
array (
0 => 'mi.dominio.cl',
),
'datadirectory' => '/var/www/html/data',
'dbtype' => 'mysql',
'version' => '23.0.3.2',
'overwrite.cli.url' => 'http://mi.dominio.cl',
'dbname' => 'nextcloud',
'dbhost' => 'db_nextcloud_lider',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'nextcloud',
'dbpassword' => 'Lider.2022',
'installed' => true,
);