I have been using my Apple TV with my Samsung TV for years just fine. The Apple TV is about 2 years old and the TV is 6 or 7 years old.
The sound on the TV is pretty bad, so I recently connecting my Sonos One to the Apple TV via Airplay. It worked well for one movie. But ever since, I get a HDCP error whenever I try to play a movie or show on Netflix, HBO Max, or Amazon (actually, sometimes I will get volume but a blank screen). YouTube TV and YouTube still work fine.
I have disconnected the Sonos One and unplugged it; I have also unplugged the Apple TV, reset it, unplugged the TV, switched the HDMI cord to a different port, changed the HDMI cord entirely, and all variations you could imagine. The problem persists. Just a week ago I was having no problems..
Has anybody encountered this? Any ideas how to fix it?