Jack bought the HDMI adapter for his iPhone to watch video on the TV and it doesn't work! What can he do? Leo says that he gets this complaint a lot and there may be an update in iOS that broke the connection. It could be copy protection. But you'd think that if Apple sells the item, they wouldn't break it with an update. Apple says to be sure the TV is set to the right HDMI selection. It should work automatically.
From the chatroom - after the iOS11 update, it didn't work. Here's a thread on Apple's discussion forum about the problem: https://discussions.apple.com/thread/8079462.