wherever i’m casting i don’t get any sound from it

Try this!

• Restart both the headset and the phone/laptop
• Disconnect Bluetooth headphones/earbuds from the Quest
• Make sure the thing you are casting to is not muted
• Stop the cast completely and start a new one

Also, some apps intentionally block or limit audio during casting due to copyright/licensing reasons, so test it in the Quest home menu first to see if system audio works there.