Kein Login möglich

Ich habe gerade Nextcloud installiert nach dieser Anleitung: https://www.c-rieger.de/nextcloud-16-installation-guide-debian-apache2/

Jedoch ist es nicht möglich sich einzuloggen, man landet immer wieder im Loginfenster.
Video: https://youtu.be/r7H_0tN6lgE

config.php

<?php
$CONFIG = array (
  'instanceid' => 'xxxxxxxxxxxxxxxx',
  'passwordsalt' => 'xxxxxxxxxxxxxxxx',
  'secret' => 'xxxxxxxxxxxxxxxxxxxx+',
  'trusted_domains' => 
  array (
    0 => 'nextcloud.dmz',
  ),
  'datadirectory' => '/var/nc_data/',
  'dbtype' => 'mysql',
  'version' => '16.0.3.0',

  'overwrite.cli.url' => 'http://nextcloud.dmz',
  'dbname' => 'nextcloud',
  'dbhost' => 'mysql.dmz',
  'dbport' => '',
  'dbtableprefix' => 'oc_',
  'mysql.utf8mb4' => true,
  'dbuser' => 'nextcloud',
  'dbpassword' => 'xxxxxxxxxxxxx',
  'installed' => true,
  'activity_expire_days' => 14,
'auth.bruteforce.protection.enabled' => true,
'blacklisted_files' => 
array (
0 => '.htaccess',
1 => 'Thumbs.db',
2 => 'thumbs.db',
),
'cron_log' => true,
'enable_previews' => true,
'enabledPreviewProviders' => 
array (
0 => 'OC\\Preview\\PNG',
1 => 'OC\\Preview\\JPEG',
2 => 'OC\\Preview\\GIF',
3 => 'OC\\Preview\\BMP',
4 => 'OC\\Preview\\XBitmap',
5 => 'OC\\Preview\\Movie',
6 => 'OC\\Preview\\PDF',
7 => 'OC\\Preview\\MP3',
8 => 'OC\\Preview\\TXT',
9 => 'OC\\Preview\\MarkDown',
),
'filesystem_check_changes' => 0,
'filelocking.enabled' => 'true',
'htaccess.RewriteBase' => '/',
'integrity.check.disabled' => false,
'knowledgebaseenabled' => false,
'logfile' => '/var/nc_data/nextcloud.log',
'loglevel' => 2,
'logtimezone' => 'Europe/Berlin',
'log_rotate_size' => 104857600,
'maintenance' => false,
'memcache.local' => '\\OC\\Memcache\\APCu',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'preview_max_x' => 1024,
'preview_max_y' => 768,
'preview_max_scale_factor' => 1,
'redis' => 
array (
'host' => '/var/run/redis/redis-server.sock',
'port' => 0,
'timeout' => 0.0,
),
'quota_include_external_storage' => false,
'share_folder' => '/Shares',
'skeletondirectory' => '',
'theme' => '',
'trashbin_retention_obligation' => 'auto, 7',
'updater.release.channel' => 'stable',
);

Im logfile wird nichts eingetragen

glaub hab den Fehler, liegt am :
sed -i "s/;session.cookie_secure.*/session.cookie_secure = True/" /etc/php/7.3/fpm/php.ini