Hello, troubleshooting for my father from afar, but I’m stuck. He has a Samsung RU 7100 UHD tv, paired with Pioneer VSX 834 receiver, and Roku Premiere streaming device. We are connected out of TV HDMI 3 (ARC). Roku seems to recognize the 5.1 set up, but not getting 5.1 surround. I think the problem is the TV settings. Tried to go to advanced audio set up but I can’t switch Audio output from PCM to anything else (Bitstream or other). I see Dolby options but they are grayed out. Receiver manual clearly says that to use DD+ then use hdmi ARC and bitstream output. I’m under the impression that Netflix only supports DD+. When on Netflix, no 5.1 options are available so I must be missing something. To be clear, all 5 speakers are working (just not 5.1 surround). Any advice would be appreciated. Thanks!