I’ve just bought a sonos beam and connected to my Samsung tv (model ue40es6710). The hdmi cable is in the ARC socket as advised but the tv will not allo me to select Dolby in the sound settings meaning it won’t change from PCM. My beam therefore only receives stereo. Pretty frustrating so is there a work around? Only other hdmi connections are for my sky box and my Samsung blue ray player. Any help would be appreciated.