Android app Login fails after "grant access"

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Nextcloud version (eg, 20.0.5): 22.2.0
Operating system and version (eg, Ubuntu 20.04): docker
Apache or nginx version (eg, Apache 2.4.25):
PHP version (eg, 7.4):

The issue you are facing:
When logging in using the Nextcloud App on Android everything works until I click “grant access”. After that I get the message: Zugriffsfehler: Operation finished with HTTP status code -1 (fail)

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

Steps to replicate it:

  1. login using the Android client
  2. grant access

The output of your Nextcloud log in Admin > Logging:

{"reqId":"v6XZaL2PSAfg6YhY3OxB","level":2,"time":"2021-11-16T19:49:26+00:00","remoteAddr":"172.22.0.1","user":"--","app":"no app in context","method":"POST","url":"/login","message":"Login failed:  (Remote IP: 172.22.0.1)","userAgent":"Xiaomi M2007J20CG (Android)","version":"22.2.0.2"}
{"reqId":"ioS2BX3G8MmRq81fVtmX","level":2,"time":"2021-11-16T19:53:32+00:00","remoteAddr":"172.22.0.1","user":"--","app":"core","method":"POST","url":"/login","message":"Login failed: 'Burger.Martina' (Remote IP: '172.22.0.1')","userAgent":"Xiaomi M2007J20CG (Android)","version":"22.2.0.2"}
{"reqId":"ioS2BX3G8MmRq81fVtmX","level":2,"time":"2021-11-16T19:53:32+00:00","remoteAddr":"172.22.0.1","user":"--","app":"no app in context","method":"POST","url":"/login","message":"Login failed: m.burger@liamix.de (Remote IP: 172.22.0.1)","userAgent":"Xiaomi M2007J20CG (Android)","version":"22.2.0.2"}

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

<?php
$CONFIG = array (
  'htaccess.RewriteBase' => '/',
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'apps_paths' =>
  array (
    0 =>
    array (
      'path' => '/var/www/html/apps',
      'url' => '/apps',
      'writable' => false,
    ),
    1 =>
    array (
      'path' => '/var/www/html/custom_apps',
      'url' => '/custom_apps',
      'writable' => true,
    ),
  ),
  'memcache.distributed' => '\\OC\\Memcache\\Redis',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' =>
  array (
    'host' => 'redis',
    'password' => '***',
    'port' => 6379,
  ),
  'passwordsalt' => '***',
  'secret' => '***',
  'trusted_domains' =>
  array (
    0 => 'localhost',
    1 => 'nextcloud.liamix.de',
  ),
  'datadirectory' => '/var/www/html/data',
  'dbtype' => 'mysql',
  'version' => '22.2.0.2',
  'overwrite.cli.url' => 'https://nextcloud.liamix.de',
  'overwriteprotocol' => 'https',
  'overwritehost' => 'nextcloud.liamix.de',
 // 'overwritecondaddr' => '192.168.10.250',
  'dbname' => 'nextcloud',
  'dbhost' => 'mysql',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'nextcloud',
  'dbpassword' => '***',
  'installed' => true,
  'instanceid' => 'oci1wwxvb0b7',
  'csrf.optout' => [
        '/^WebDAVFS/', // OS X Finder
        '/^Microsoft-WebDAV-MiniRedir/', // Windows webdav drive
        '/Nextcloud-android/',
    ],
 /* 'trusted_proxies' =>
    array (
      0 => '172.0.0.0/8',
      1 => '172.22.0.1',
    ),*/
);

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

172.22.0.3 - - [16/Nov/2021:20:15:54 +0000] "GET /login/flow/grant?clientIdentifier=&stateToken=my9BOlDtwJ5gotpdD2v6z4T73MGyRcA4HreNazoVG1Bw3FxfhwjN5NPy7SsxKfMK HTTP/1.1" 303 874 "-" "Xiaomi M2007J20CG (Android)",
172.22.0.3 - - [16/Nov/2021:20:15:54 +0000] "GET /login?redirect_url=/login/flow/grant?clientIdentifier%3D%26stateToken%3Dmy9BOlDtwJ5gotpdD2v6z4T73MGyRcA4HreNazoVG1Bw3FxfhwjN5NPy7SsxKfMK HTTP/1.1" 200 4764 "-" "Xiaomi M2007J20CG (Android)",

Login through Chrome on any system (Android, Windows, MacOS) works fine.

On the Android Nextcloud-App I get the following error: WhatsApp Image 2021-11-16 at 21.00.47

I tried working through earlier bug reports and help entries like this one: Login stalls at "grant access" with new login method on Docker installation · Issue #4786 · nextcloud/android · GitHub but that did not help. Setting the required config-settings (overwrite.cli.url) does nothing.

The setup is the following:
traefik2 (on docker) => Nextcloud