Flathub will not install in latest Qubes OS. Qubes 4.2 Final

I am trying to use Flatpak in the latest Qubes OS. Fedora 38 Qube.

I get failure with the Terminal entry of flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo

There is Qubes documentation (Solene'% : Flatpak integration in Qubes OS templates) that gets me to the point where I enter this. Actually I found I needed to install flatpak itself. dnf install flatpak. (I don’t have Qubes OS in front of me right now)

I guess to someone more experienced in Qubes, the next step to fix this is obvious.

Hoping someone around here is a Qubes user, as well as experienced in flathub,

Thanks for reading, and any help given.

I get failure with the Terminal entry of

What is the error you see?