A few months ago, many users noticed that AirPlay on older Apple TV models no longer works with DRM-restricted content after the iOS 16 update. However, it seems that the problem goes far beyond that, as there are reports that such content can no longer be played using HDMI adapters as well.
Streaming apps no longer work with HDMI adapter in iOS 16
According to posts made on the Apple Discussion Forums, iPhone and iPad users can no longer watch video from streaming platforms like Netflix, Amazon Prime Video, and HBO Max on a TV using an HDMI adapter. Users claim that the adapter can still mirror the device’s screen, but the screen goes black when they try to play any DRM-restricted video.