Aliucord is a Open Sourced Discord client for android devices. (you can view the repo here: https://github.com/Aliucord/Aliucord) Overall, my experience has been amazing with Aliucord. I've been able to chat, call, and screenshare with my friends with ease. I'm able to play games, and continue to screenshare, and talk to my friends at the same time. The only downside to this app is the application's tab will only be in the aspect ratio of a mobile device, you can't actually "fullscreen" it. Other than that, it's very good.

Before you use the app, ensure you allow it access to your required permissions. (so go in settings, give it microphone permissions, storage permissions, etc)