Installing signal_desktop

Trying to install signal_desktop on a new install (and have had it installed for ages, and working previously), and all I get is complaint that “nothing provides…” when installing libabsl?
Have tried installing from, and as a flatpak - same issue.
Sure there is an easy fix for this, but I can’t find it.
Any clues? (or other ways to install)

Without actual commands you used and their full output? Not really.

Using discover to install - worked…