Amusingly, my AppleTV is currently the one thing that doesn't even though it used to - for some reason, with no changes, it just stopped turning on the TV. Switch 2 can happily turn on the TV though. Most peculiar.
(I've tried updating the AppleTV, replugging the HDMI cable, unplugging the HDMI cable for <period of time>, etc. Nothing has worked. TV does not have any network which means it can't have had any nefarious updates.)