With Arc the tv remote controls the volume of the HDMI Arc connected device. It’s like a remote but it sends the signal through the HDMI instead of the ir sensor.
The TV HDMI input active has to be the one that supports arc
Anynet+ has to be set to ON in the Samsung TV settings menu.
The audio receiver must be fully powered on. Standby mode works with some receivers for passthrough, but Arc requires power over HDMI to control the volume using the tv remote on the receiver.
So it should work. Those Sony receivers have a settings menu I think. It shows up on the Arc connected tv screen if u press menu on the Sony audio remote.
Also the optical is confusing when trying to use Arc, when you’re setting up Arc, unplug the optical until you get it setup. The receiver has to pick the audio in source, either arc HDMI or optical. The Arc volume control doesn’t work for optical connections. Hope this helps!