Apple releases iOS 11.2.1 on Wednesday. The maintenance release specifically addresses an issue with remote access and the Home app. Home is Apple’s controlling app for HomeKit smarthome devices.
Patch Notes for iOS 11.2.1
iOS 11.2.1 fixes bugs including an issue that could disable remote access to shared users of the Home app.
The update is a 68.7MB over-the-air (OTA) download on iPhone X. It’s available now.