Discord - Stream screen not working?

I wanted to stream League of Legends on Discord. Since I'm still relatively early and my colleague wanted to give me tips, I wanted to stream on Discord. However, this did not work, or you could hear the sound effects, but he could not see my screen. Does anyone have any idea what the problem here might be?

* Games with a laptop that are relatively ok.

Maybe share your screen and not the application

Tried it too, but unfortunately it didn't work

If you've tried streaming over a phone call, try streaming on a server.

I haven't tried it yet, I'll do it tomorrow.