Use a browser instead of the Netflix app
Turn off hardware acceleration in your browser
Turn off hardware acceleration in Discord
Disable any browser extensions that affect video or DRM
Clear your browser cache and cookies
Update your browser to the latest version
Update Discord to the latest version
Stream the browser window, not the entire screen
Use a different browser if the black screen persists
Check that Netflix is not blocked by DRM or protected content settings
Restart Discord and your browser after changing settings
Run Discord as administrator on Windows
Disable GPU acceleration in your system graphics settings if needed
Make sure your graphics drivers are up to date