Cannot See Group-Shared Calendar

[Elefo]

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Nextcloud version (eg, 29.0.5): 29.0.6
Operating system and version (eg, Ubuntu 24.04): Ubuntu 22.04
Apache or nginx version (eg, Apache 2.4.25): 2.4.52
PHP version (eg, 8.3): 8.1

The issue you are facing:
Group ABC has been seeing the group-shared Deck and Calendar for 2 months already and, after adding a new user to the group, the new user can see the shared Deck but not the shared calendar.

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

Steps to replicate it:

1. Create a group using 3 capital letters, let’s just use ABC, as above. I have to reiterate this because I’ve read about hyphens in group names voiding calendar-sharing.
2. Create a calendar using the Admin account then save.
3. Share the calendar to group ABC with editing capabilities and get them to add inputs to it.
4. Add another user to the group.
5. The new user cannot see the shared calendar.

What I did was just share the group calendar directly to him and he’s able to see it on the left pane.

The output of your Nextcloud log in Admin > Logging:

1. Error	index	
TypeError OCA\Calendar\Controller\SettingsController::__construct(): Argument #4 ($userId) must be of type string, null given
"Sep 24, 2024, 4:51:39 AM"	
2. Error	index	
TypeError OCA\Calendar\Controller\SettingsController::__construct(): Argument #4 ($userId) must be of type string, null given
"Sep 24, 2024, 4:50:49 AM"	
3. Warning	cron	
Background job OC\Preview\BackgroundCleanupJob (id: 38, arguments: null) ran for 9849 seconds
"Sep 24, 2024, 4:49:12 AM"	
4. Error	PHP	
unlink(/var/www/nextcloud/data/appdata_oc396mt35bqk/richdocuments/remoteData/capabilities): No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#348
"Sep 24, 2024, 4:44:09 AM"	
5. Fatal	no app in context	
NotFoundException /appdata_oc396mt35bqk/richdocuments/remoteData/capabilities
Could not boot richdocuments: /appdata_oc396mt35bqk/richdocuments/remoteData/capabilities
"Sep 24, 2024, 4:43:43 AM"	
7. Fatal	no app in context	
NotFoundException /appdata_oc396mt35bqk/richdocuments/remoteData/capabilities
Could not boot richdocuments: /appdata_oc396mt35bqk/richdocuments/remoteData/capabilities
"Sep 24, 2024, 4:43:43 AM"	
8. Error	PHP	
unlink(/var/www/nextcloud/data/appdata_oc396mt35bqk/richdocuments/remoteData/discovery): No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#348
"Sep 24, 2024, 4:43:42 AM"	
9. Fatal	no app in context	
NotFoundException /appdata_oc396mt35bqk/richdocuments/remoteData/capabilities
Could not boot richdocuments: /appdata_oc396mt35bqk/richdocuments/remoteData/capabilities
"Sep 24, 2024, 4:43:42 AM"	
10. Error	PHP	
unlink(/var/www/nextcloud/data/appdata_oc396mt35bqk/richdocuments/remoteData/capabilities): No such file or directory at /var/www/nextcloud/lib/private/Files/Storage/Local.php#348

Here is a screenshot related to the first log as it hangs initially as soon as I open it.

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

<?php
$CONFIG = array (
  'instanceid' => '',
  'passwordsalt' => '',
  'secret' => '/',
  'trusted_domains' =>
  array (
    0 => 'localhost',
    1 => '192.168.0.1',
    2 => '',
  ),
  'datadirectory' => '/var/www/nextcloud/data',
  'dbtype' => 'mysql',
  'version' => '29.0.6.1',
  'overwrite.cli.url' => 'https://192.168.0.1/nextcloud',
  'dbname' => 'nextcloud',
  'dbhost' => 'localhost',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => '',
  'dbpassword' => '',
  'installed' => true,
  'maintenance_window_start' => 1,
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'default_phone_region' => 'NZ',
  'mail_smtpmode' => 'smtp',
  'mail_smtpauth' => 1,
  'mail_sendmailmode' => 'smtp',
  'mail_from_address' => '',
  'mail_domain' => '',
  'mail_smtphost' => '',
  'mail_smtpport' => '',
  'mail_smtpname' => '',
  'mail_smtppassword' => '',
  'maintenance' => false,
  'theme' => '',
  'loglevel' => 2,
  'twofactor_enforced' => 'false',
  'filesystem_check_changes' => 1,
  'twofactor_enforced_groups' => 
  array (
  ),
  'twofactor_enforced_excluded_groups' => 
  array (
  ),
);

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.
^The logging page hangs for now.