UPDATE: Most of the problems seem to be fixed now. Sadly, there’s nothing you can do about this – except avoiding the game like the plague until the next patch or hotfix. Patch 0.2 was supposed to fix a bunch of issues, but it had the nasty side effect of resetting progress for a lot of people (NOTE: it did not actually reset progress, there was a bug in the UI and no players actually lost anything), including wiping their star cards (NOTE: preventing them from using the unlocked star cards).
Star Wars Battlefront 2 has been patched today, and the update has made things worse for some players.