subwoofer not connecting

Describe your system. Which speaker do you want to connect to? 

From your profile you have an Arc Ultra and Sub 4, the app should take you through the connection process.

Hopefully you didn't follow the bad advice AI offers about disabling Wi-Fi as that doesn't do what it says, it turns off tne radio used to connect to tne Sub.

https://support.sonos.com/en-us/article/set-up-your-sonos-sub

https://support.sonos.com/en-us/products/sub-4

Doesn’t play sound or doesn’t connect? Please elaborate.