Need Help: How to configure REDIS for Nextcloud

Hi! I´m using Nextcloud and try to set it up to use REDIS.

I followed the official guide:

https://docs.nextcloud.com/server/20/admin_manual/configuration_server/caching_configuration.html

but unfortunally the Nextcloud System check still says, that I didn´t user any Memory-Cache System.

There´s no error in log files.

Can someone help?

Regards,
Kai