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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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.