Add HDR10 For 1080P Display, not just 4K!!!

I can also confirm this. I have an LG 4k Display. I had to enable deep color to use 4k, HDR10 is not an option with my monitor but it was not in the specs so I was not expecting it, just the 4k resolution.

The xbox started flickering immediately and stopped when using 1080p resolution. I found this post and tried using a cheap walmart HDMI cable instead of the provided cable, the flickering went away and I can run 4k. The provided cable appears to be a 1080p
only cable (if such a thing exists), they should have marked it, especially with the first 4k console.

Upscaling basically stretches the picture to match the resolution of your display (e.g. 1080p game/movie will be stretched to fit your 4K display resolution). The main difference between the S and X is the hardware, which is mainly utilized for games. The
S will render games up to 1080p and upscale to 4K. The X is able to render and output at native 4K (only if the game is "Xbox One X Enhanced").

Both the Xbox One S and Xbox One X play 4K movies the same. They can both output movies in
native 4K, as well as optionally support HDR (HDR10 profile). You just have to be sure that you are streaming in 4K or use a UHD Blu-Ray, and your TV set supports it.

Go for the Xbox One S if you want a 4K movie player with the option to game. If its movies you only care about, and you want to spend the
least amount of money, then go for the LG player you mentioned.

This will sound a little odd but, I found this on an older thread about the same thing:

"You need to enable 'Allow 4K' in video modes in settings. It won't put your display into 4K, but it will allow you to tick the HDR10 box underneath after you enable it."

https://answers.microsoft.com/en-us/xbox/forum/all/will-xbox-series-xs-support-hdr-for-1440p-or-1080p

Whilst your screen is not 4k (far as I can tell it is a Wide 1080p), that is how you enable HDR apparently.

I switched the cables around and the ps5 displays 4k on both. In the "4k details" section it is red marks all the way down. No option to change refresh rate with auto detect on. my drop down 720p, 1080p, 4k UHD. But when I change it, it just changes back to 1080p and says tv doesn't support 4k

Xbox One S is not really a 4K console,

4K Media Content - Yes

You can play 4K Blu-ray DVD's or Streaming services like Netflix in 4K just fine if your paying the the 4K subscription options,

4K Gaming Content - No

As for games, it only plays games at 1080p but it is upscaled to 4K, other wise a 1080p image without upscaling to 4K, will look much worst on a 4K screen than what it would do, if it was only displayed on a 1080p screen,

A 1080p image upscaled on a 4K screen does look a little better than a 1080p image on a 1080p screen, but it still a 1080p image made to fit a 4K resolution screen, which is what the Xbox One S does

Xbox One X is a 4K console,

4K Media - Yes

4K Gaming - Yes

The issues is not the TV, it's the Xbox One S not being an Xbox One X.