I have the center channel consisting of two speakers sitting side by side in the center. These are both hooked to the center channel.
left and right front towers, sub, and then the left and right rear surrounds. Then I have ceiling speakers for Atmos.
All of them are wired up correctly to the corresponding spots on the back of the receiver as everything works on most streaming services etc.
I've got it all working on my Xbox and Roku TV for the surround sound using eArc HDMI.
But the YouTube app will only play the left and right front towers on every thing I've tried selecting for some reason. I don't mind if it's just basic stereo if I can get it to hit the surrounds and preferably the sub.
Also, my phone will connect via Bluetooth and play on all speakers no matter what it is via stereo.