When I go to create an automation on my iPad which shows as the home hub device and is updated to iOS 11 I see this message:
To run automations based on other people's arrival or departure, make sure your home hub's software is up-to-date.
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Sign up to join this communityNot viable for many, but deleting and rebuilding my home enabled this feature. I use an ATV4 for a hub and tried disconnecting/reconnecting to no avail.
I solved it like this:
Miguel’s advice about signing out and back in to iCloud on the Apple TV didn’t work for me. I had to add the extra step of (temporarily) making my iPad Pro the home hub and then signing back into iCloud on the Apple TV.
I had to toggle off and back on the home hub switch for my iPad and then the iOS 11 automations showed up.