HDR completely Broken

I have the same problem with the Samsung g8 g80sd Oled.

Can anyone help us?

Hey guys, I had the same issue with Samsung G8 and fixed it by setting local dimming off under monitor's settings >> System >> Local Dimming.

My workaround for this is

Load fc25 as normal

Alt tab open hdr calibration tool on the first slider amend the slider as normal then back out and go back into fc25 hdr is properly enabled then.

Before doing this trick everything is washed out and no contrast or colour hardly after doing it things are as it should be with hdr.

Did the same on my old LG hdr ips display aswell as new oled hdr400

Force icc works also but then it disables freesync for me 

This doesn't seem like an HDR settings issue. I have the same kinds of issues with FA25 while all my other games are fine. 

In the FA25 video calibration screen it shows washed out pink and wants the monitor adjusted to make it red - but the game isn't outputting red and no amount of calibration or settings tweaks are going to make enough difference.

I've tried the hacks and workarounds in this thread and none of them work. Turning off all HDR in windows and using a non-hdr monitor does make the game playable (although it still looks pretty drab) but I can't get it to look good on an HDR monitor no matter what settings I try... even using windows compatibility modes doesn't fix it. The game really needs an option to turn off the broken HDR attempt (or a fix)

The same happens to me, and I have the same monitor as you. Did you find any solution? Every game runs perfect in HDR, except EA FC 25. I noticed some thing VERY strange, if I turn up or down the volume, the HDR turns on and the game looks AWESOME, but just for a few seconds, while the volume bar is showing in the screen, the second it disappears the game goes back to that washed and horrendous image. As I mentioned before, it only happens in this game, it's so annoying!!!