Wow, there is a lot of misinformation in this thread. ikowilson's solution back on the first page worked for me, thanks.
I don't think it is necessary in most cases to reset HomeKit, just delete the shared user's Homekit configuration and continue on. I found that the two critical items from the procedure above are the invitation via icloud mail, and then making sure the user with whom the Home is shared deletes the default (local) Home account. I also recommend renaming Home to something else so that there is no confusion.
However, if you configure the Eve app with information about your rooms and lights, Siri will respond to more logical voice commands to control them. Hue's interface to edit Homekit information is virtually nonexistent. That is part of the problem with folks saying that Siri only responds to limited commands about the lights - Homekit initially uses the default names for the lights, which you have undoubtedly renamed in Hue.
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Everyone, I got it to work but you need to carefully follow these directions. You will need to do some reconfiguring on some level.
1. Presuming your phone will be the main account for the HomeKit settings, start by resetting your HomeKit Configurations under Settings / Privacy / HomeKit
2. Using your phone, go to this link:http://www2.meethue.com/media/3173537/pressguidelines_homekitcompressed.pdf and follow the directions. You will need a third party app like Elgato Eve to set this up.
3. After you have successfully configured your lights, test to make sure all your Siri commands work (both rooms and scenes).
4. To share your HomeKit settings you will need to enter in your roommate or family member's icloud account. NOTE: I tried to add my girlfriend's account using her gmail account associated with her apple ID. That didn't work. I had to use her @icloud.com email.
5. Once you've added it, the other person's phone will say that they have been invited. They have to go to Settings / Homekit and accept the invitation.
6. It took me awhile to figure this out but this is important, your roommate/family member should download the Elgato Eve app and start it up. The settings should automatically have been added when it launches.
7. Your roommate / family member must go to Settings / Homekit. They will see that there is a local HOME account and also a shared HOME account. They must delete their local Home Account (not shared) so that only the shared one exists. Siri didn't respond to commands on the shared account until I did that.
Hope that helps. I can explain in more details if anyone has questions.
