Can't enable HDR at 1080p on capable TV

Seems weird that it can't as the Xbox One S does 1080p HDR, can't you just change the resolution to 1080p in the settings and have HDR enabled in the advanced video settings

According to some support documentation, it seems you
must have a 4K+HDR display in order to enable HDR.

I suppose 1080p+HDR displays weren't a thing yet when the Xbox One S came out. A bit ironic since the game is rendered at 1080p anyway on the Xbox One S!

One thing to do for now is to submit your feedback to request HDR support for 1080p+HDR displays: http://xbox.uservoice.com Make a new thread with this request, or vote on existing threads if someone else already has
the idea. If a thread gets enough votes by the community, the idea will be officially evaluated by Microsoft and they may push it into future system updates.

Skyrim won't be 4K, it's basically running an updated engine with new graphical effects at 1080p - Think Skyrim with Fallout 4 visuals. So will Skyrim look nice? Absolutely yes, no question. If Skyrim supports HDR, which it most likely will, then yes,
it would look better on a HDR supported TV. As far as I've seen HDR is only on 4K TV's, I have not seen it on 1080p displays. HDR is a hardware display technology, to see HDR, you'll need an HDR TV and the content you are watching or playing needs to be
HDR.

The Xbox One S's 4K abilities are only confined to video playback via from UHD Blu-ray or 4K capable streaming.

I dont own another hdr capable tv. So i can't try that

The first thing to look at is your tv settings for your input. Make sure you have it set to 1080i/1080p and that you do not have any zoom settings enabled. I am assuming your tv is 1080p capable.