Recently bought the Samsung Q80T and Q70 soundbar feeling confident they would work together. After setting them up, I found that the sound bar was not recognised by the TV via the eARC (HDMI) port, so it seems that Samsung have an issue with this port EVEN with their own product. I contacted the retailer and they are going to send me a new sound bar to try, but reading other post, I think it may well be the TV eARC port which is the problem.
New sound bar delivered, but still have a Problem. The QSymphony feature does not work as detailed on the Samsung website see below. When the sound bar is connected by eARC unable to select D.IN so the TV + sound bar does not appear in the TV sound output menu. Also in the source menu the sound bar is not recognised. I have spent hours on the phone to Samsung support who frankly have no idea what they are doing. I will now be asking my retailer to take back the TV and sound bar as it is not fit for purpose. Extremely frustrating now not a Samsung fan any more