HDMI-CEC volume feature not working with xbox series s

Hi.

My name is Renato.
I'm an Independent Advisor and a Microsoft Xbox user like you.

In fact, I did some research, and there are several users complaining about a similar issue to yours. It probably depends on a lack of full compatibility with the TV.

Theoretically, if power on and off functions are working, it means that the settings are correct.
In any case, make sure your cable is good, and if possible, try a different one. Disconnecting and reconnecting the power from the TV can perform a soft reset on the TV and might resolve the issue. Also, check for any updates on your TV. I'll also include the link to the official guide with all the information regarding HDMI-CEC.
https://support.xbox.com/help/hardware-network/display-sound/hdmi-cec

Kind regards
Renato

Hi TexasMaster9351! My name is Ricardo an independent advisor ready to help you with this situation!

HDMI-CEC is supported only on Xbox One X, Xbox Series S, and Xbox Series X. You must also enable HDMI-CEC on your TV.

Xbox Series X|S consoles can use an HDMI feature called Consumer Electronics Control (CEC) to send commands to and from CEC-enabled devices (such as TVs and AVRs) that are connected to the console.

This feature can be turned on and off via the TV & A/V power options settings screen. Press the Xbox button  to open the guide, then go to Profile & system > Settings > General > Sleep mode & startup > TV & A/V power options.

Hello,

I found this support page with some troubleshooting for the HMDI CEC: How do I control other devices using HDMI-CEC? | Xbox Support

I also found a thread where the last poster may have found a resolution to this issue: Xbox Series S - HDMI-CEC Volume Control not working - Microsoft Community, stating:

For anyone looking for the resolution, you have to use hdmi cables, even to your soundbar or sound system now

Previously I had my xbox series x I had an optical cable from tv to bose soundbar 700 and the older xbox would control it and raise and lower the volume, I had to swap that cable out for HDMI instead...

With more details I would check that out to see if it helps.

Also, it would help if you submitted a Report a Problem so we can take a look at what's going on with your xbox when this issue happens. You can find the guidance here. It also seems like some have found the builds in Xbox Insider have the update that may help with this issue in the test builds and updates.

Provide feedback to Team Xbox | Xbox Support

Thank you,

Thendercleetz, HDMI-CEC support doesn't have to be an 'all or nothing' feature. If given the proper configuration settings, Kinect IR blaster and HDMI-CEC could work in tandem quite well. As you say most cable boxes don't support this feature, so they would
be continued to controlled by the Kinect, the rest by HDMI-CEC (with the ability to turn this on/off). As for the Power On/Off, HDMI-CEC is a two-way communication if you turn the Xbox on and the TV and AVR are both already powered on it's checks that and
does nothing. For powering off, we would need to be given an additional option (just as PS4 does). 'Power off console only', and 'Power off all components'.

You can control your Set Top Box (STB) if it supports HDMI-CEC. You maybe able to control your TV, but again it needs to support HDMI-CEC.

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Some STBs do not feature HDMI-CEC protocol (e.g. Sky HD STB), which means it can't be controlled via Xbox One. You need a Sky remote.