Can't Get DLC Units from blitz packs

I can’t get any DLC units from the blitz packs and I also never get any DLC challenges when i have all the DLC

I would bet that you don’t have this account that you are posting on the forums to as owning the Season pass. You have it through someone else’s license, aka someone on the same machine owns Halo Wars 2 and the Season pass or that you are sharing someone else’s home gold. Not owning the Season pass, but being licensed to use it will allow you to play in Multiplayer modes with the leaders, but you will not be able to be granted them in card packs.