Have you called Sonos Support directly to discuss it?
When you speak directly to the phone folks, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.
Without any knowledge about your network device, or the nature of your of your actual network, or the where your controller is running, or which version of the Sonos controller, at best we can give vague suggestions.
Which soundbar? There are three current versions, with two different types of connections to the TV, and several more no longer made.
Is something connected to your network, and you can’t add these other devices?