After some hours of research i did it and found my mistake after i saw your comment with the unhandled exception. This message i got only if the maintenance-mode is enabled!
Short answer: my redis docker container was misconfigured and i got a “connection refused” error. after i start it like this: “redis-server --requirepass SUPER_SECRET_PASSWORD” instead of writing the password in the redis.conf it run like a charm!
i didn’t have to change the RedisFactory.php at all but i also didn’t used quotation at all!
thank you a lot!