January 2018
NOPE not FIXED at least on PC!
February 2018
February 2018
April 2018
I had the same problem and here is the solution ....
You have to use the CARD "DEFENDER" (VERTEIDIGER)!
You can use 3 cards. One of them has to be the defender card to solve this progress! (it's the first boost card)
It is possible to finish this progress with lvl 70 as well!