Make sure that the switch next to Allow Airplay & Handoff is turned on. To check this, go to the Settings app on your device and tap on Airplay & Handoff. One possibility is that Airplay is only enabled for audio and not video on the device that you’re trying to Airplay from. There are a few possible explanations for why this might be happening. It’s a common issue that many Apple users face- being able to Airplay sound from their device, but not the screen.
