Are you logged in to the proper EGS account that has ownership of the game and season pass? How to Verify that you’re logged into the correct Epic Games account - explanation by Epic: LS-0021: Your account doesn’t own this game - Epic Games Support
Are not the add-ons disabled in the manage add-ons section? How do I manage DLC in the Epic Games Launcher? - Epic Games Support
Have you tried running the game without an EGS launcher? Go to where your game is installed and run PhoenixPointwin64.exe. In my case, it is D: Program Files\Epic Games\Phoenix Point\ PhoenixPointwin64.exe
If you are an early backer (before March 2019) you are eligible for 2 copies of the game. If that is the case write an email from your backer email to contact@snapshotgames.com and we will give you a Steam or GOG key depending on your choice.