Device: iPhone 6s
iOS: 10.2 beta
Description: The AirDrop settings in Control Center are grayed out even though it is set to “everyone.”
Cause: Opening the Accessibility menu while the AirDrop menu is open.
Recreate By: Open the AirDrop menu from Control Center. Triple click the home button to open the Accessibility menu and then close it. Finally, push the home button a last time to close the AirDrop settings menu.