After playing several task games I noticed that the rewards are not awarded.
I had the task to play with 3 Gulvania troops, which I did but didn’t get the rewards. Then I tried another task, to play with red troops but there was the same problem, after playing no rewards.
The game does notice I’m playing several games since the task to win 75 games does recognize the games played.
Right after I wrote the previous text I went back to the game and now none of the task rewards are given.
I play on PC via Steam.