You need to go into the setting of the game and make a possible recording of the screen while you are in the game. There is some security department in the setting of the game. I also had this problem. Once started my stream, and I didn't know about this security update. I started to play the game, and the viewers were saying that the screen is black, and they don't see anything. After that, I entered to play on some
csgo gambling sites, and they could see it. After thirty minutes one of my followers told me how to solve this problem and continue streaming.