Since upgrading to Sierra and iOS 10, both my Mac and iPhone find an AirPlay device named "Apple TV (2)". The thing is, I don't own an Apple TV. Selecting the phantom device always results in "Could not connect to “Apple TV (2)”".
This is on my home Wi-Fi network, which is definitely locked down (and I can see from AirPort Utility that there's only these 2 Wi-Fi clients on it). I've also noticed this problem occur on some other Wi-Fi networks.
I have a MacBook Pro running Sierra 10.12.1 GM (latest), iPhone 6s running iOS 10.0.2 GM (latest), and a 5th gen (current) Time Capsule with firmware 7.7.7 (latest).
Yes, I have rebooted all three devices.
I've even done a clean install of Sierra (following http://www.macrumors.com/how-to/macos-sierra-clean-install/) and created a clean user account. The problem reproduces across user accounts.
I'm clearly hitting a bug somewhere, but I wonder why more people aren't hitting this problem? Any ideas on how I can further debug this? I don't see anything relevant in Console logs, but perhaps I'm not looking in the right place.