When you say "trade in" do you mean "purchase tickets" or "refund ticket value"?
The pumas game isn't regular season so you can only opt-out of that. You should be able to use your ticket bank balance toward extra seats for the pumas game though.
For Dallas, you should be able to use your ticket bank balance toward extra seats for this too. If you are unable to, your rep can do it manually. I think a few other people were having similar issues.
not sure what your account says to make you think you have tickets. but if you opted out of 2021, then your 2020 balance should be refunded in december during the "settle up" period. If you see an account balance, that's probably your 2020 balance. If you want to know if you have actual tickets, just click on MY EVENTS on the top left. IF there are tickets, then you have tickets and there must have been some mix up with the opt out process.
You can also try clicking on the PAID button under invoices and see if there is a 2021 invoice. If there is, then you were probably never opted out.
Hope that helps!