No 4k output to Panasonic TC-55CX420U with Xbox One S

Also Misses Quinzel, I find it very rude and disrespectful that you marked your own answer as the "verified" answer even though it clearly does not answer the question at all and I, as the OP, did not state that your response answered my question at all
(because it doesn't).

If you as "Official Staff" don't understand the question being asked, or don't understand the technical issues behind it, the only helpful thing you can do is to escalate this to someone higher up the chain. Marking your response as verified is a form of
thread sabotage as far as I am concerned.

My tv is a Vizio M-43c, 2015. Has no HDR at all, but the features menu on my X1S say the top feature, upscaling, will work. The rest are blocked out. And I can confirm it does. Looking at my TV's info display, it says 2160p even while playing a game, and
it looks spectacular.

I don't have any 4k blue rays to test, nor do I have 4k on Netflix and 4K isn't supported in our Youtube yet. But unless HDR10 is supported in mine and I don't know it, you don't have to have it for regular 4k upscaling and display.

Maybe the tool isn't reporting correctly?

As far as I can tell it does not specifically state that HDR10 is required just to set the 4k resolution (just that it is required for HDR), that wouldn't even make sense. HDR10 is not required for something to display content in a specific resolution, the
resolution 3840x2160 doesn't require HDR to work, resolution is independent of HDR.

And I already know that my TV doesn't support HDR or at least doesn't support the HDR10 protocol, but that is fine, I don't care about HDR, but I do care about running things in the 3840x2160 resolution at 60Hz (which my TV definitely supports). If this
is the case MS has made a device that only works with like 10 models of TV's... why are they even selling this?

Seems to me like either a bug or an arbitrary restriction put in place to make people go spend $1500-$5000 on a brand new 2016 OLED TV supporting HDR10. I see no legitimate technical reason that the resolution can't be set to 4k without HDR. Even 4k blu-rays
with HDR do not require the TV to have HDR, it just shows the film minus the HDR details when played on a non-HDR TV.

This is what I like to call total hog wash and MS needs to fix it.

Hey, Bad! It looks like you might have actually found the issue.

According to my TV's specs it supports everything required except for HDR10 ...

In the
support article that Mister Mascot linked to you on Friday calls this out as being the issue.

• For HDR, make sure your TV supports the HDR10 media profile. Check your TV manual to verify. Some manufacturers may not mention HDR10—look for support of BT2020 and HDR, or some of the names in the previous list. (Also, there are two HDR formats: Dolby
  Vision and HDR10. Your TV can support both, but it must at least support HDR10.)

• 
  

*emphasis my own*

You will need to have HDR10 (also called BT2020) on your TV to be able to use full 4K capabilities. Because your TV does not have it, you will have to use basic 1080p on your TV. Looking at the
manual online for your TV (I believe this is the one, let me know if it isn't), I am unable to find that it supports 4K outside of the resolution; there are no mentions for 4K items in this manual other than the resolution and the name of model.

Sorry to see that the TV doesn't support HDR10 to be able to display 4K quality items on your Xbox One S. If this smart TV updates to support it and you still run into issues, please be sure to post back so that we can troubleshoot further. Thanks for understanding!

So far, it seems like the X1 S is only partially compatable with a tiny number of 4k tv's and only fully compatable with an even smaller, much more expensive range.