This is supposed to be set around the same time as Star Wars Rebels, and in that show, the Rebel Alliance definitely existed already, though they were not yet as strong as they were at the Battle of Yavin IV.
I liked Andor, though, and I'm not that upset about it. Maybe Ferrix is just such a backwater that the Rebellion is far, far away. It's the kind of place that makes Tatooine seem cosmopolitan.