With the first betas of iOS 11.3 and tvOS 11.3, when you installed these updates on an iOS device and two or more fourth or fifth-generation Apple TVs, AirPlay 2 could be used to stream music to multiple devices at the same time.
As an example, with two Apple TVs running tvOS 11.3 set up in different rooms of the house, you could use an iPhone to play the same song on both through AirPlay 2’s multi-room audio feature.
Installing tvOS 11.3 also added the Apple TV to your HomeKit setup, with the Apple TV present in the Home app.
As noted by iDownloadBlog, all of these features are now missing in iOS 11.3 and tvOS 11.3 beta 3. There are no options to play audio to multiple sources and the Apple TV has been removed from the Home app.
The AirPlay 2 feature was buggy and not fully functional, which may be why it’s been removed. It is not clear at this time if Apple plans to re-introduce the AirPlay 2 functionality in later iOS 11.3 and tvOS 11.3 betas.
AirPlay 2 was first announced as part of iOS 11 in June, but it did not show up in the launch version of the new operating system. When officially released, AirPlay 2 will allow HomePod, Apple TV, and supported third-party speakers to work together.
Once AirPlay 2-compatible products are widely available, you will be able to use AirPlay 2 to control all of the different speakers and devices throughout your home, for a full multi-room audio experience.
This kind of multi-room audio support was a main feature advertised for the HomePod, but Apple opted to ship the speaker without it.
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