I have followed The instructions noted below. In the Sonos app when I ran TV set up, it would not run. The Sonos arc connected to the TV. However, when the tv is shut off, it reverts to the internal speaker.
here are the steps I followed
Disconnect everything from the TV including the Arc and unplug the TV and Arc from power for a couple of minutes. Then plug everything back in but keep everything disconnected. Enable Simplink on your TV, then run TV Setup in the Sonos app under the Arc’s settings. When the app instructs you to, connect the Arc to the TV’s HDMI ARC port using the Sonos-supplied HDMI cable. When the Arc has been successfully connected, connect any other device to the TV.
is there another more reliable way to connect the sinks arc to the tv? Bluetooth? Optical?