Microsoft has released a new update for Xbox Beta app for iOS. The latest update bumps the app to v712.1222.0301 and brings Xbox Live Party Chat for iOS. The feature allows players to chat during games cross-platform between Xbox 360, Xbox One, and Windows 10.
The latest feature is still in beta and is not available for everyone. Although if you wish to test the app and the new features then you can apply for the beta here and wait for approval from Microsoft. Once approved, you will be able to try new features before everyone else. The feature recently made its way to the Android Beta app as well so we can expect it to roll out for public soon.