The latest version of the Omna app for iOS and Android will allow you to view video remotely on your camera without any special setup.
To view video remotely with the Home app:
You need to have an Apple TV or iPod on as a hub to view video remotely.
https://support.apple.com/en-us/HT207057There have been some issues with iOS 11.2. Here is Apple's response:
The iOS 11.2.1 update addresses bugs and issues that have been discovered since the release of iOS 11.2.
According to Apple's release notes, the update re-enables remote access for shared users of the Home app. Apple broke remote access for shared users when implementing a fix for a major HomeKit vulnerability last week.
The HomeKit bug allowed unauthorized access to HomeKit accessories that included smart locks, and it was fixed server-side by Apple after it was made public. To address the issue immediately, Apple had to disable remote access for shared users, which the company said it would re-enable through an iOS update this week.
Following today's update, the HomeKit vulnerability is fully patched and remote access for shared users has been reinstated.Make sure you update to 11.2.1 (or higher since Apple will probably have another update soon).
Source -
https://www.macrumors.com/2017/12/13/apple-releases-ios-11-2-1-update-with-homekit-fix/
