Xbox Series S HDMI-CEC won't change the input. can I set a delay?

The Xbox Series X|S doesn't have the feature to turn over the channel yet. That is currently in testing by the Xbox Insiders. It should be released in a future public update. Until then, you will have to change the channel manually.

No that's not it. I'm not an insider and my series S does change the input when the TV is already on.

I believe the Xbox one/360 line should be updated to support CEC

Not happening. IR only.

Minor workaround: plug a device with CEC into your Xbox's HDMI input. When you turn it on, your CEC supported display(s) should change inputs.

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.

Have you checked the TV itself?

I have an LG TV (different model) and sometimes HDMI-CEC is disabled on my Xbox One X's HDMI input after I change audio output (if I want to use my headphones for a while, for example). Its weird, I've never been able to get to the bottom of why
it happens but, sure enough, go to my TV's general settings while on the HDMI input and SIMPLINK (LG's name for HDMI-CEC) is off. Turn it back on and I'm good to go.

- Jason