Here is my setup:
This is all Samsung. Still, I can't get the sound to take advantage of both sound bar and speaker at the same time.
With the multiroom app, it works fine from a phone. It is possible to group MS750 and R6 to have the same audio on both.
But from the TV, it looks impossible. The Surround sound option is greyed out. From other posts, I tried to:
but no improvement. The sound bar is connected on HDMI-ARC, and also on Wi-Fi and Bluetooth.
Please, how to get multiroom/surround audio from TV like I have from a phone ?