Discord Screen Share

I'm using discord on my mobile (Phone= Huawei P40 Lite). My friends were screen sharing from a PC, i wanted to watch it but it didn't work. When i watch stream, it goes black screen. I can hear but cant watch it. When my friend uses ALT+TAB the stream shows itself for a second but it freezes again. But when i try other people, servers; i can watch them. We tried another server but it didn't work either. Can someone help me about it?