An Apple TV (2nd generation or later) running tvOS 12 or later. Issue Likely Cause Solution.
Update tvOS to Enable Casting from iPhone to Apple TV
The 4th generation and Apple TV 4K feature a more modern design with a Siri remote. However, if you are connected to a Bluetooth speaker or soundbar, you may need to adjust the audio output settings within the Control Center to ensure sound plays through the correct device.
Tapping this icon sends only the video stream to your television, leaving your phone free to handle other tasks without interrupting the viewing experience. To successfully cast your iPhone to Apple TV, you need: An iPhone, iPad, or iPod touch running iOS 12.
Update tvOS to Ensure Smooth Cast from iPhone to Apple TV
Whether you are presenting a slideshow for work or watching a movie with family, the process is designed to be intuitive. The process is consistent across recent models of iPhones and iPads.
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