Thanks a lot for your response
Neither does Steam in Flatpak work for me (albeit, this is not what I am asking to be supported in this thread), nor does this have to do with Flatpak support.
The error message seems to suggest, that a package called 'steam-devices' is missing and this is something to be installed in the host OS.
Apparently, the team, that packages Steam for Flatpak seems to suggest this package to be installed by the package manager.
