Nextcloud Activity Email Notifications for Users being added to Groups

Hello. I have searched to see if I can find the answer to my query already, but I haven’t managed to find anything, so apologies in advance if this has already been answered.

Nextcloud version (eg, 18.0.2) : 19.0.6
Operating system and version (eg, Ubuntu 20.04) : Ubuntu Server 20.04 LTS
Apache or nginx version (eg, Apache 2.4.25) : Apache/2.4.41
PHP version (eg, 7.1) : PHP 7.4

NextCloud - Config.php

<?php
$CONFIG = array (
  'instanceid' => 'ocihlyxg8dpb',
  'passwordsalt' => 'REMOVED VALUE'
  'secret' => 'REMOVED VALUE'
  'trusted_domains' => 
  array (
    0 => 'servername.domainname',
    1 => 'url.domainname',
    2 => 'servername',
    3 => 'IP address',
  ),
  'datadirectory' => '/remote-server/share',
  'dbtype' => 'mysql',
  'version' => '19.0.6.2',
  'dbname' => 'dbname',
  'dbhost' => 'localhost',
  'dbtableprefix' => 'oc_',
  'dbuser' => 'dbuser',
  'dbpassword' => 'dbpassword',
  'mysql.utf8mb4' => true,
  'installed' => true,
  'ldapIgnoreNamingRules' => false,
  'mail_smtpmode' => 'smtp',
  'mail_from_address' => 'REMOVED VALUE',
  'mail_domain' => 'domain name',
  'mail_smtphost' => 'smtp host',
  'mail_smtpport' => '25',
  'forcessl' => true,
  'overwrite.cli.url' => 'https://url.domainname/instancename',
  'overwriteprotocol' => 'https',
  'logdateformat' => 'D, d M Y H:i:s',
  'loglevel' => 2,
  'logtimezone' => 'Europe/London',
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' => 
  array (
    'host' => '/var/run/redis/redis-server.sock',
    'port' => 0,
    'timeout' => 0.0,
  ),
  'default_language' => 'en',
  'default_locale' => 'en_GB',
  'theme' => '',
  'skeletondirectory' => '',
  'sharing.maxAutocompleteResults' => 25,
  'sharing.minSearchStringLength' => 3,
  'simpleSignUpLink.shown' => false,
  'auth.webauthn.enabled' => false,
  'maintenance' => false,
  'updater.release.channel' => 'stable',
  'updater.secret' => 'REMOVED VALUE',
);

I’ve only very recently taken on support of NextCloud in our Organisation, and my involvement has been to upgrade our Ubuntu Server from 16.04 LTS to 20.04 LTS, along with upgrading NextCloud from v15 to v19.

As part of this, I have also been trying to implement various recommended optimisations (e.g. Opcache, Redis etc.).

One thing that has been brought to my attention is that our IT Support staff who create NextCloud accounts and groups are now getting activity notifications when a user is added to a group, and this wasn’t the case previously.

I’ve looked at the Activity section in NextCloud, but all the options relate to the upload/download/deletion of files and folders. There is nothing relating to email notifications for when users are added to groups.

Is there a way to configure this / prevent the emails from being sent?

Any help would be greatly appreciated.

Many thanks.