Sonos Arc & Beam Volume rocker not working on remote with Samsung TV

What model TV do you have?

Do you use a streamer such as an Apple TV?

Are you using the TV remote for everything?

Did you do the Remote Control Setup from within the room settings?

How do you have your Sonos Arc connected to the TV? By chance, are you using the optical port, rather than using ARC?

I have this same issue.  
 

I have the Samsung - 77” Class S84D Series 4K OLED Smart Tizen TV.   I am using the eArc HDMI connection.  When you use volume up/down button the screen shows the connection but does not go up and down.   Hold the volume up button and you hear beeping but volume does nothing.   

So, in that configuration, the Sonos should be getting volume commands from the TV set, via CEC carried on HDMI-ARC. Which means Anynet+ (what Samsung calls CEC) needs to be turned on in the TV’s settings. And that there needs to be a good connection between the ARC/eARC port and the Sonos. Some people have had issues with the former, some with the latter. 

If you’re still having issues after checking both those things, I would recommend that you submit a system diagnostic within 10 minutes of experiencing this problem, and call Sonos Support to discuss it.

There may be information included in the diagnostic that will help Sonos pinpoint the issue and help you find a solution.

When you speak directly to the Support staff, they have tools at their disposal that will allow them to give you advice specific to your network and Sonos system.

Oh, one more thing. I’d also reboot the TV set (and the Sonos) by unplugging them from the wall for two minutes. This will force both devices to reload their OS, in case there is something odd there….