Yesterday Apple released several software updates including TV Software 7.3.1 for Apple TV 3rd generation. This new update follows May’s release of 7.3 which introduced Apple TV Channels.
Apple TV Software 7.3.1 provides support for testing AirPlay from your apps to Apple TV (3rd generation) only.
iOS device setup might not initiate when using a device running iOS 12. (49118658) Workaround: Manually enter your network information and Apple ID to complete setup.
Known Issues You may receive an error when first signing in to an Apple ID with two-factor authentication enabled. (44959672) Workaround: Get your verification code then re-enter your password followed by the six-digit code directly into the password field.