No TV sound thru new Playbar

TV is Sony KDL-40S4100. Specs say it delivers PCM/Dolby Digital. Playbar works perfectly with Sonos network. TV sound works with TV speakers. Tried two different optical cables. TV auto play is on. But in no case does TV sound come thru Playbar.

Suggestions before I return the Playbar to Magnolia AV? Not interested in buying a new TV right now

Thanks in advance