Xbox not controlling TV

the xbox does not support cec or hdmi control, you would need to go to tv setting on the xbox and setup tv control again as it may have lost the code, the xbox controls tv's via infrared only.

I have this same issue, I just got my Xbox One X, and set up the Xbox to control my TV as well, and the Xbox says it recognizes my TV and is controlling it, and will turn itit onon and off, but when it comes to controlling the volume nothing will happen.

the xbox does not support cec or hdmi control, you would need to go to tv setting on the xbox and setup tv control again as it may have lost the code, the xbox controls tv's via infrared only.

TV Controls: These include On/Off, Volume Up/Down, Mute, and TV Input.

TV Service on Xbox 360 Controls: Live TV, if provided on your Xbox 360 console, can be controlled with Channel Up/Down, Guide, Live TV, Info, and Last. Record can record content only on a DVR from your TV service provider.

Media Playback Controls: Use Play/Pause, Skip Forward, Fast Forward, Skip Back, Fast Back, and Display to control DVD, CD, or streamed media.

Navigation Controls: These include the A, B, X, and Y buttons, D-pad navigation (up, down, left, right), Back and Select.

Xbox Guide Control: Allows you to access the Xbox Guide at any time.

the xbox does not support cec or hdmi control, you would need to go to tv setting on the xbox and setup tv control again as it may have lost the code, the xbox controls tv's via infrared only.

I have tried setting it up with the code again, but that doesn't work.

Good news! I got Alexa control working again on the Xbox. Since Alexa sends the signal to the Xbox to turn the volume up/down on the TV, I went to TV control settings in the Xbox settings. Someone had played around with these settings and turned off TV control.
Now Alexa can control the Xbox/TV volume again.

Unfortunately, the problem with the Xbox app connecting to my Xbox continues. Any advice on this would be appreciated! Thank you for the responses so far!