I have followed all the airplay advice. I still do not have airplay icon on any of my devices. iPhone 5 iPhone 4S ipad 2 ipad 3 Apple TV. All my devices are software upto date.
It helps if you confirm what steps you have taken incase you miss something. Make sure all have same apple id and same network, reboot ATV with all cables out for 30 seconds and reboot the router too.
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