Sony Blu ray player set to PCM, linked to LG B9 Oled tv via hdmi. HDMI set to PCM, TV set to Dolby Digital. Sonos Beam linked to Tv via Arc input. No sound whatsoever from Beam when playing a blu ray disc. Have I done something wrong with this set- up not to be getting sound? All other input, Sky Q, Firestick, Netflix etc all work fine. Any help appreciated.