OAuth login button not showing - Users

16 Oct 2024

      Hello,
I'm trying to set up Rouncube for OAuth authentication but I'm probably 
missing something trivial, because the button for OAuth login doesn't 
even show on the login page.
I'm using Docker image roundcube/roundcubemail:latest
Here are the contents of the config file inside the container :
/var/www/html/config/config.docker.inc.php

<?php
   $config['db_dsnw'] = 
'mysql://[LOGIN]:[PASS]@mariadb.[DOMAIN.TLD]:3306/roundcube';
   $config['db_dsnr'] = '';
   $config['imap_host'] = 'tls://mail.[DOMAIN.TLD]:143';
   $config['smtp_host'] = 'tls://mail.[DOMAIN.TLD]:587';
   $config['username_domain'] = '';
   $config['temp_dir'] = '/tmp/roundcube-temp';
   $config['skin'] = 'elastic';
   $config['request_path'] = '/';
   $config['plugins'] = 
array_filter(array_unique(array_merge($config['plugins'], ['archive', 
'zipdownload'])));
include('/var/roundcube/config/oauth2.inc.php');

/var/roundcube/config/oauth2.inc.php

<?php
$config['oauth_provider'] = 'generic';
$config['oauth_provider_name'] = '[DOMAIN.TLD]';
$config['oauth_client_id'] = '[CLIENT_ID]';
$config['oauth_client_secret'] = '[CLIENT_SECRET]';
$config['oauth_config_uri'] = 
'https://auth.%5BDOMAIN.TLD%5D/.well-known/openid-configuration';
$config['oauth_issuer'] = null;
$config['oauth_jwks_uri'] = null;
$config['oauth_auth_uri'] = "https://auth.%5BDOMAIN.TLD%5D/oauth2/authorize";
$config['oauth_pkce'] = 'S256';
$config['oauth_token_uri'] = null;
$config['oauth_identity_uri'] = null;
$config['oauth_logout_uri'] = null;
$config['oauth_timeout'] = 10;
$config['oauth_verify_peer'] = true;
$config['oauth_scope'] = "email profile openid";
$config['oauth_auth_parameters'] = [];
$config['oauth_identity_fields'] = null;
$config['oauth_login_redirect'] = true;
$config['oauth_debug'] = false;
$config['oauth_cache'] = 'db';
$config['oauth_cache_ttl'] = '8h';
$config['oauth_user_create_map'] = [
     'user_name' => ['name'],
     'user_email' => ['email'],
     'language' => ['locale'],
];
$config['oauth_password_claim'] = null;

What am I missing?
Thanks