External Storage cannot select Groups or Users

Nextcloud version: 20.0.0
Operating system and version: Docker (linuxserver Docker Image)
nginx version: 2018/08/16
PHP version: 7.3.23

The issue you are facing: Cannot add groups or users to external storage. “Available for” remains empty.

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

Steps to replicate it:

  1. Add App external storage
  2. Add new external storage (e.g. local)
  3. Try selecting “Available for” and no users or groups are selectable

The output of your Nextcloud log in Admin > Logging:
Nothing at the specific time.

The output of your config.php file:

<?php
$CONFIG = array (
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'datadirectory' => '/data',
  'instanceid' => 'ochxdde0x2tk',
  'passwordsalt' => '...',
  'secret' => '...',
  'trusted_domains' => 
  array (
    [...]
  ),
  'dbtype' => 'mysql',
  'version' => '20.0.0.9',
  'overwrite.cli.url' => 'https://some.url',
  'dbname' => 'nextcloud',
  'dbhost' => 'nxt-mariadb:3306',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'user',
  'dbpassword' => '...',
  'installed' => true,
  'overwriteprotocol' => 'https',
  'trusted_proxies' => 
  array (
    0 => '172.19.0.0/24',
  ),
  'ldapIgnoreNamingRules' => false,
  'ldapProviderFactory' => 'OCA\\User_LDAP\\LDAPProviderFactory',
);

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

192.168.11.12 - - [18/Oct/2020:14:08:27 +0100] "GET /apps/files_external/applicable?pattern=&limit=30&offset=0&_=1603026446692 HTTP/1.1" 200 107 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36"
192.168.11.12 - - [18/Oct/2020:14:08:32 +0100] "GET /apps/files_external/applicable?pattern=&limit=30&offset=0&_=1603026446693 HTTP/1.1" 200 107 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36"
192.168.11.12 - - [18/Oct/2020:14:08:33 +0100] "GET /apps/files_external/applicable?pattern=&limit=30&offset=0&_=1603026446694 HTTP/1.1" 200 107 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.75 Safari/537.36"

In Version 19.0.3 the selection works.

image

I think that’s a know issue in Nextcloud 20 which will most likely been fixed with the upcoming minor release.