Start with these simple steps before assuming something is broken ...

I am assuming here that both the devices are paired. You can confirm that by going to Settings > Devices > Bluetooth. You can then follow the tips mentioned below if the Bluetooth speaker is connected ...

If there is no sound when your computer is connected to your TV with an HDMI cable, use the fixes provided below to get rid of this problem. It is important that the audio device you want to use is ...

"Continuous Audio Connection" seems to solve audio issues with Sonos speakers.