Ok I'm going to try and I will tell you up front I am not the best person to be answering but I figure something is better than nothing.
Could you tell me what card you are trying to upgrade and what chem it isn't allowing you to add or which one you are trying to add?
I personally haven't messed with any power ups except the mut captain so I could use my tokens, if you are new you can upgrade your team a lot with just the players given out in solos for quite a while. After that learning the market and finding deal and flipping cards would be my next suggestion. The only reason I say that and the reason I have stayed away from power ups is because if you do something wrong or change your mind you only get 50% back in the refund. So with all the different power up passes you will get along the way and the ones to still be release, the card I might have wanted to power up a couple weeks ago wouldn't be the same I want to power up a couple weeks from now.
I would say the only exception to this approach is if you are running a theme team, which I don't understand myself, if I wanted to play with players from all the same team, I'd just start a franchise mode with that team, but some people love them and they are good for the salary cap version of online play. Or if you know you want a player on your team for the duration of Madden20 then why not get the power up level them to the max and enjoy.
Hope this helped at least a little, and if anyone is around with more knowledge please post.
Hi folks. I'm totally new to MUT in Madden. I've played Madden for years but just H2H games with friends. Really getting into MUT but finding it a bit confusing. I'm wondering if someone can point me in the right direction that explains the different card types in the store and the capabilities of each type. I don't understand why I can't upgrade some cards more than once for something like a Chemistry but others can be upgraded multiple times to higher overall levels. I know this has something to do with Power Up cards but I can't get my head around it after watching some YouTube videos about how it all works. Help appreciated. Thanks.