After the Season 6 update, CE in general (both Campaign and Multiplayer) won’t load for me. I’ve tried uninstalling the game and reinstalling it, I’ve tried restarting the Campaign. Every other game works fine, it’s just CE that refuses to load for me.
As this appears to be an issue with your game, we recommend heading over to https://aka.ms/HaloSupport for further assistance. Please review the latest known issues and submit a ticket if your issue is not listed.
Thanks!