Black screen when mirroring Netflix and others
Netflix, Disney+, Prime Video, Apple TV+ and most paid streaming apps use copy protection (DRM). It blocks screen mirroring from any phone, so you'll see a black screen or no picture. No app can get around this, and it isn't a fault in your TV or iPhone.
What works: open the streaming app on the TV itself. Use the app launcher in TVkip to open it in one tap, and the keyboard to search.
Photos, your own videos, games and most other apps mirror and cast normally.