For some reason the color balance feature on my AppleTV 4k where you hold your iPhone up to the screen will not work. Takes a long time for it to even start then always fails. I’ve tried everything I can think of but nothing works. Anyone seen this before? Running the latest OS.
Have noticed the same today. Got my unit a week back, started off with SDR 50 as suggested in this forum and was able to color balance. Today I was experimenting with HDR 50/60 and the colors looked very washed out. Tried balancing, the message was unable to color balance.