That was the problem. When I plugged the Apple TV in to port 2 I could enable Dolby Vision. I have to say that I didn’t like it at all. Way too dark. I think I’ll just stick with 4K unless someone here can point me to the proper settings for Apple TV and our 900F TVs To balance out content on Netflix and other streaming apps where ultra 4K and Dolby Vision both look good. I know there has to be some sort of solution.