Activity Notifications for People that have Access but No Account

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Nextcloud version: 22.2.3
Operating system and version: Debian GNU/Linux 11 (bullseye)
Apache or nginx version (eg, Apache 2.4.25): Apache/2.4.48 (Debian)
PHP version (eg, 7.4): PHP 8.0.10

The issue you are facing:
I don’t get Notification if a new File is Uploaded on the mailbox i share the Folder to.

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

Steps to replicate it:

  1. Create A new Folder with an User Account
  2. Press the Share Button
  3. Enter an Non-Registered E-Mail
  4. Wait some time and Add Files

The Mailbox does not Recive Update Notifications

The output of your Nextcloud log in Admin > Logging:

Error	PHP	Error: unlink(/var/www/html/data/appdata_ocomijmvhaph/css/federatedfilesharing/4039-9653-settings-admin.css.gzip): No such file or directory at /var/www/html/lib/private/Files/Storage/Local.php#291	
2021-11-17T14:53:08+0100
Error	PHP	Error: Trying to access array offset on value of type null at /var/www/html/apps/dav/lib/CalDAV/BirthdayService.php#306	
2021-11-17T14:25:01+0100
Error	PHP	Error: Trying to access array offset on value of type null at /var/www/html/apps/dav/lib/CalDAV/BirthdayService.php#306	
2021-11-17T14:25:01+0100
Error	PHP	Error: Trying to access array offset on value of type null at /var/www/html/apps/dav/lib/CalDAV/BirthdayService.php#306	
2021-11-17T14:25:01+0100
Error	PHP	Error: Trying to access array offset on value of type null at /var/www/html/apps/dav/lib/CalDAV/BirthdayService.php#306	
2021-11-17T14:25:01+0100

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

$CONFIG = array (
  'instanceid' => '*************',
  'passwordsalt' => '*************',
  'secret' => '********************************',
  'trusted_domains' =>
  array (
    0 => '********',
  ),
  'datadirectory' => '/var/www/html/data',
  'dbtype' => 'mysql',
  'version' => '22.2.3.0',
  'overwrite.cli.url' => '********',
  'dbname' => '******',
  'dbhost' => '******',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => '******',
  'dbpassword' => '*********',
  'installed' => true,
  'mail_from_address' => '*********',
  'mail_smtpmode' => 'smtp',
  'mail_sendmailmode' => 'smtp',
  'mail_domain' => '*********',
  'mail_smtphost' => '*****************',
  'mail_smtpport' => '25',
  'skeletondirectory' => '/var/www/html/base-files',
  'updater.secret' => '**************************************',
  'maintenance' => false,
  'loglevel' => 2,
);

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

[Wed Nov 17 00:00:01.793918 2021] [mpm_prefork:notice] [pid 1072] AH00163: Apache/2.4.48 (Debian) configured -- resuming normal operations
[Wed Nov 17 00:00:01.793949 2021] [core:notice] [pid 1072] AH00094: Command line: '/usr/sbin/apache2'
[Wed Nov 17 14:52:44.352068 2021] [access_compat:error] [pid 2944] [client *********] AH01797: client denied by server configuration: /var/www/html/data/.ocdata
[Wed Nov 17 15:06:45.454189 2021] [access_compat:error] [pid 5956] [client *********] AH01797: client denied by server configuration: /var/www/html/data/.ocdata

unfortunately, that functionality is not implemented. It would be amazing if it was. I think it is something that can be implemented as an add-on.