I have been trying to find Apple TV in my Samsung ue40h6400, however it doesn’t appear to be something I can find on the apps. My tv is around 5 years old, any idea when the software may be available on it?
Yes the Apple Tv app was available on select 2018 models plus 2019 sets and beyond generally. See more here https://www.samsung.com/us/support/Apple Tv
However certainly not compatible with the H6400 which is a 2014 model. https://www.samsung.com/uk/support/model/UE40H6400AKXXU/