Today Apple has made iOS 11.2.1 and tvOS 11.2.1 available to download and install. They should already be rolling out over-the-air to supported mobile devices and Apple TV consoles. Both of these releases practically fix the same thing: the inability to use remote access in HomeKit for shared users. This was temporarily disabled last week through a server-side switch, in order to swiftly address a newly discovered vulnerability in Apple's smart home framework, which allowed unauthorized access to occur in certain conditions. It was a pretty nasty bug, letting unauthorized people access...
Source: https://www.gsmarena.com/ios_1121_and_tvos_1121_now_available_to_restore_remote_access_in_homekit-news-28712.php
