I'm using OpenSUSE Tumbleweed. I don't see any obvious errors. I have Redis, RabbitMQ, and Mercure running.
When did you make your attempt? The admin guide had a major update a couple weeks ago. It's a lot more complete now.
The only problem I'm having is a permissions issue with uploaded media files. If I ran kbin as the nginx user, it would work fine, but running as a separate user, nginx isn't granted permission to read the files. I added a default ACL on the public/media directory, but it did not propagate to newly created subdirectories. Finally, I added a script that watches the directory with inotify and fixes permissions as soon as files/directories are created.