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Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
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): 27.1.1
Operating system and version (eg, Ubuntu 20.04): RH EL 9.2
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.53-11
PHP version (eg, 7.4): 8.1.14-1
The issue you are facing: When I logon as an administrator user, under “Administration settings” I can see a message which tells me that the “sodium” PHP module is missing.
but it seems that the sodium package is not available for my version of PHP:
[root@linuxNC ~]# pecl install libsodium
pecl/libsodium requires PHP (version >= 7.0.0, version <= 8.0.99), installed version is 8.1.14
No valid packages found
install failed
Am I wrong?
In case I am not, what about that warning message that shows that the “sodium” module is missing?
Is this the first time you’ve seen this error? No
Steps to replicate it: Access to the “Administration settings” as an administration user
The output of your Nextcloud log in Admin > Logging:
none
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'oc3qhcuc9rfv',
'passwordsalt' => '***',
'secret' => '***',
'trusted_domains' =>
array (
0 => 'ncintra.comune.re.it',
1 => 'openappstest.comune.re.it',
2 => 'openapps.comune.re.it',
),
'datadirectory' => '/opt/ncintra/data',
'dbtype' => 'mysql',
'version' => '27.1.1.0',
'overwrite.cli.url' => 'http://ncintra.comune.re.it',
'dbname' => 'ncintra',
'dbhost' => 'localhost:3306',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => '***',
'dbpassword' => '***',
'installed' => true,
'overwriteprotocol' => 'https',
'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
'memcache.local' => '\\OC\\Memcache\\Redis',
'filelocking.enabled' => true,
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => 'localhost',
'port' => 6379,
'timeout' => 0.0,
),
'mail_smtpmode' => 'smtp',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => 'NC',
'mail_domain' => 'comune.re.it',
'mail_smtphost' => '***',
'mail_smtpport' => '587',
'maintenance' => false,
'loglevel' => 2,
'debug' => false,
'allow_local_remote_servers' => true,
'mail_smtpauth' => 1,
'mail_smtpname' => '***',
'mail_smtppassword' => '***',
);
The output of your Apache/nginx/system log in /var/log/____:
nothing about the error mentioned in that log file
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.
nothing important