"no app in context", users cannot login with good credentials, and admin password resetting doesn't work

Software Version
Nextcloud version (eg, 18.0.2): 19.0.1
Operating system and version (eg, Ubuntu 20.04): CentOS 8
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.37
PHP version (eg, 7.1): 7.4.9

The issue you are facing:

Is this the first time you’ve seen this error? (Y/N): Yes

Steps to replicate it:

  1. Left-click my user circle in the top right corner
  2. Left-click “Settings”
  3. Left-click “Overview” in the Apps Information field
  4. Wait for Nextcloud’s security checks to complete (the only one it flags me on is that I have not yet set up HSTS)
  5. Left-click the “Open updater” button
  6. Left-click the “Start update” button

The output of your Nextcloud log in Admin > Logging:

Error	PHP	Module 'pdo_mysql' already loaded at Unknown#0	2020-09-14T12:50:10-0600
Error	PHP	Module 'pdo_mysql' already loaded at Unknown#0	2020-09-14T12:45:10-0600
Error	PHP	Module 'pdo_mysql' already loaded at Unknown#0	2020-09-14T12:40:10-0600
Error	PHP	Module 'pdo_mysql' already loaded at Unknown#0	2020-09-14T12:35:10-0600
Error	PHP	Module 'pdo_mysql' already loaded at Unknown#0	2020-09-14T12:30:11-0600
Error	PHP	Module 'pdo_mysql' already loaded at Unknown#0	2020-09-14T12:25:10-0600

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'instanceid' => '$instanceid',
  'overwrite.cli.url' => 'https://nextcloud.example.com/',
  'htaccess.RewriteBase' => '/',
  'passwordsalt' => '$passwordsalt',
  'secret' => '$secret',
  'trusted_domains' => 
  array (
    0 => 'nextcloud.example.com',
  ),
  'datadirectory' => '/var/www/html/nextcloud/data',
  'dbtype' => 'mysql',
  'version' => '19.0.1.1',
  'dbname' => '$dbname',
  'dbhost' => '$dbhost',
  'dbport' => '',
  'dbtableprefix' => '$dbtableprefix',
  'mysql.utf8mb4' => true,
  'dbuser' => '$dbuser',
  'dbpassword' => '$dbpassword',
  'installed' => true,
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'ldapIgnoreNamingRules' => false,
  'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
  'mail_from_address' => 'cloud',
  'mail_smtpmode' => 'smtp',
  'mail_sendmailmode' => 'smtp',
  'mail_domain' => 'mail.com',
  'mail_smtphost' => 'smtp.mail.com',
  'mail_smtpport' => '587',
  'mail_smtpdebug' => true,
  'maintenance' => false,
  'updater.secret' => '$updater.secret',
);

The output of your Apache/nginx/system log in /var/log/____:

/var/log/httpd/access_log

/var/log/httpd/error_log:

Other Notes: