Roku streaming stick not outputing Dolby Digital to Yamaha Sound bar
I recently upgraded my Roku to a Streaming Stick+. My set up is a Samsung TV with ARC on HDMI input 1, a Yamaha sound bar with just HDMI ARC in and out and a Monoprice HDMI switch. The Roku and the Xfinity cable box are both plugged into the switch. The Xfinty cable box outputs in Dolby to the sound bar, but the Roku is picked up as optical. I have the Roku set for Dolby Digital on HDMI. I have tried different ports on the HDMI switch, but the Roku still is detected as optical not Dolby. Does anyone have an idea on how to fix this? I have tried plugging the Roku into the sound bar due to how it is mounted under the TV. It is hard to access the ports without taking the sound bar off the wall.