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Sorry to hear you’re facing problems 
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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): 25.0.3
Operating system and version (eg, Ubuntu 20.04): Fedora 37
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.56
PHP version (eg, 7.4): 8.1.17
The issue you are facing:
I have created a couple shares. When I select the share and start to type in a username to add to the share, the system never finds the user and the little circle keeps spinning. I do have a couple of users defined and I can see them under users.
Is this the first time you’ve seen this error? (Y/N):
Y
Steps to replicate it:
- Log in to user that created the folder
- Select files and navigate to the shared folder
- Click on … under the folder and select Shared
- Enter the name or e-mail of the user you want to share the file
The output of your Nextcloud log in Admin > Logging:
Shows "ACCESS FORBIDDEN"
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'log_type' => 'syslog',
'datadirectory' => '/var/lib/nextcloud/data/',
'updatechecker' => false,
'check_for_working_htaccess' => false,
'asset-pipeline.enabled' => false,
'assetdirectory' => '/var/lib/nextcloud',
'preview_libreoffice_path' => '/usr/bin/libreoffice',
'apps_paths' =>
array (
0 =>
array (
'path' => '/usr/share/nextcloud/apps',
'url' => '/apps',
'writable' => false,
),
1 =>
array (
'path' => '/var/lib/nextcloud/apps',
'url' => '/apps-appstore',
'writable' => true,
),
),
'passwordsalt' => '*********************',
'secret' => '***********************************',
'trusted_domains' =>
array (
0 => 'mydomain.com:8080',
1 => '192.168.15.2',
),
'dbtype' => 'mysql',
'version' => '25.0.3.2',
'overwrite.cli.url' => 'http://localhost',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => '**************',
'dbpassword' => '***************',
'instanceid' => 'ocsdjgbwnplb',
'installed' => 'true',
'mail_smtpmode' => 'smtp',
'mail_sendmailmode' => 'smtp',
'mail_from_address' => 'username',
'mail_domain' => 'mydomain.com',
'mail_smtpauthtype' => 'PLAIN',
'mail_smtphost' => '192.168.15.254',
'mail_smtpport' => '25',
'mail_smtpsecure' => 'tls',
'mail_smtpauth' => 1,
'mail_smtpname' => '**********',
'mail_smtppassword' => '*************',
);
The output of your Apache/nginx/system log in /var/log/____:
192.168.15.186 - - [14/Apr/2023:10:12:26 -0400] "PROPFIND /nextcloud/remote.php/dav/files/dboyer/ HTTP/1.1" 207 240 "-" "Mozilla/5.0 (Windows) mirall/3.8.0stable-Win64 (build 20230331) (Nextcloud, windows-10.0.19045 ClientArchitecture: x86_64 OsArchitecture: x86_64)"
192.168.15.186 - - [14/Apr/2023:10:12:56 -0400] "PROPFIND /nextcloud/remote.php/dav/files/dboyer/ HTTP/1.1" 207 240 "-" "Mozilla/5.0 (Windows) mirall/3.8.0stable-Win64 (build 20230331) (Nextcloud, windows-10.0.19045 ClientArchitecture: x86_64 OsArchitecture: x86_64)"
192.168.15.186 - - [14/Apr/2023:10:13:20 -0400] "GET /nextcloud/ocs/v2.php/apps/user_status/api/v1/user_status?format=json HTTP/1.1" 200 151 "-" "Mozilla/5.0 (Windows) mirall/3.8.0stable-Win64 (build 20230331) (Nextcloud, windows-10.0.19045 ClientArchitecture: x86_64 OsArchitecture: x86_64)"
192.168.15.186 - - [14/Apr/2023:10:13:20 -0400] "GET /nextcloud/ocs/v2.php/apps/notifications/api/v2/notifications?format=json HTTP/1.1" 304 - "-" "Mozilla/5.0 (Windows) mirall/3.8.0stable-Win64 (build 20230331) (Nextcloud, windows-10.0.19045 ClientArchitecture: x86_64 OsArchitecture: x86_64)"
192.168.15.186 - - [14/Apr/2023:10:13:26 -0400] "PROPFIND /nextcloud/remote.php/dav/files/dboyer/ HTTP/1.1" 207 240 "-" "Mozilla/5.0 (Windows) mirall/3.8.0stable-Win64 (build 20230331) (Nextcloud, windows-10.0.19045 ClientArchitecture: x86_64 OsArchitecture: x86_64)"
PASTE HERE
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.
ACCESS FORBIDDEN