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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): 21.0.3
Operating system and version (eg, Ubuntu 20.04): 20.04
Apache or nginx version (eg, Apache 2.4.25): apache 2.4.41
PHP version (eg, 7.4): 7.4.3
The issue you are facing:
For some reason all of the passwords on my machine are expiring simultaneously. Reset my passwords a couple days ago when this first happened and now they are expired once again for all accounts.
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it: Not sure
The output of your Nextcloud log in Admin > Logging:
{"reqId":"6JBrtqN0d7QdsqXpUKjg","level":4,"time":"2021-08-06T20:03:49+00:00","remoteAddr":"128.59.168.121","user":"--","app":"webdav","method":"PROPFIND","url":"/nextcloud/remote.php/dav/files/Nate/","message":{"Exception":"Sabre\\DAV\\Exception\\ServiceUnavailable","Message":"OC\\User\\LoginException: Password is expired, please use forgot password method to reset","Code":0,"Trace":[{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Auth/Plugin.php","line":182,"function":"check","class":"OCA\\DAV\\Connector\\Sabre\\Auth","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Auth/Plugin.php","line":137,"function":"check","class":"Sabre\\DAV\\Auth\\Plugin","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"beforeMethod","class":"Sabre\\DAV\\Auth\\Plugin","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":456,"function":"emit","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":253,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":321,"function":"start","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/lib/Server.php","line":332,"function":"exec","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/appinfo/v2/remote.php","line":35,"function":"exec","class":"OCA\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/remote.php","line":167,"args":["/var/www/nextcloud/apps/dav/appinfo/v2/remote.php"],"function":"require_once"}],"File":"/var/www/nextcloud/apps/dav/lib/Connector/Sabre/Auth.php","Line":163,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Linux) mirall/3.2.3git (build 6319) (Nextcloud, ubuntu-5.4.0-77-generic ClientArchitecture: x86_64 OsArchitecture: x86_64)","version":"21.0.3.1","id":"610d95a63a471"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'oc8c96624wgb',
'passwordsalt' => '***',
'secret' => '***',
'trusted_domains' =>
array (
0 => 'x.x.x.x',
1 => 'xxx.xxx.xxx.xxx',
),
'datadirectory' => '/data/nextcloud/data',
'overwrite.cli.url' => 'http://xxxx/nextcloud',
'dbtype' => 'mysql',
'version' => '21.0.3.1',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'dbuser' => 'nextcloud',
'dbpassword' => '***',
'installed' => true,
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'memcache.local' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => 'localhost',
'port' => 6379,
),
'mail_from_address' => 'nc-noreply',
'mail_smtpmode' => 'smtp',
'mail_smtpauthtype' => 'PLAIN',
'mail_domain' => 'x.x.x.x',
'mail_smtphost' => 'x.x.x.x',
'mail_smtpport' => '25',
'maintenance' => false,
'theme' => '',
'loglevel' => 2,
'twofactor_enforced' => 'false',
'twofactor_enforced_groups' =>
array (
),
'twofactor_enforced_excluded_groups' =>
array (
),
'mysql.utf8mb4' => true,
'auth.bruteforce.protection.enabled' => true,
'trashbin_retention_obligation' => 'auto, 7',
'versions_retention_obligation' => 'disabled',
'appcodechecker' => true,
'updater.release.channel' => 'stable',
'mail_sendmailmode' => 'smtp',
'data-fingerprint' => 'ad687b914ed06e81a4bc79c00d53e3b7',
'default_phone_region' => 'US',
);
The output of your Apache/nginx/system log in /var/log/____: