Can't do anything with cards from MCS Twitch Packs

Just a follow up that I figured out what the issue was. If the cards in your lineup are locked, the game doesn't recognize that you have them. For example. If you have 2 LG cards and they are both locked, if you get another LG card in a pack and then try to sell it, the game won't let you sell it because it thinks you don't have the minimum allowed players at LG. So you get the error I reported. 

Hope that helps someone else some day.