I cannot add flatpaks as user, what am I doing wrong?

SOLUTION: add Flathub as a user remote too:

flatpak remote-add --user --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo

flatpak lets you install applications as user vs system. I want to install as user because my .var is full.

example: flatpak install --user org.fcitx.Fcitx5 returns error: No remote refs found for ‘org.fcitx.Fcitx5’

flatpak remotes returns flathub system

I'm logged in as user5. whoami returns user5

I don't know what remote I have to add or if I have to add user5 as a remote