Apple TV volume control

I have been using an Apple TV connected to my Samsung TV for 2 years. All this time I’ve been able to control the TV volume with the Apple TV remote. All of a sudden on Friday it stopped working. Nothing I have tried has been able to restore the control. Was there an Apple TV software update recently that might have broken this?

I think this is something to do with HDMI-CEC, may be this article would help

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