Just run "TV setup” in the Sonos App (Settings/System/eBeam Room Name]) when you are ready to connect the Beam to your new TV and follow the onscreen instructions in the Sonos App.

If using the TV’s HDMI-ARC/eARC port fir it’s connection, then enable CEC in the TV settings and set that ARC/eARC port to be used for Audio-Out from the TV Sound settings.

Also see this Support link which may prove helpful:

https://support.sonos.com/en-us/article/tv-requirements-for-sonos-home-theater-speakers