LG smart Tv 

set the audio output to Sonos Move2

from the Sonos app select 2 x play 1 

I would usually select the above when watching You Tube

ive updated to the new Sonos app and now adding other speakers doesn’t work (please try later) message-

have reset all speakers / rebooted router / reinstalled Sonos app / hardwired speakers (rj45) /  

still not functioning - will only link to the Move2