I have two Schlage Smart Sense Deadbolt locks. I have an Apple TV (4th Generation) running tvOS 12 acting as a HomeKit bridge. All this worked great for a couple of months, but recently, when using Siri on my iPhone 6s running iOS 12.0.1 to "Unlock the front door" I get
Sorry, I can't unlock your doors. For more details, check the Home app.
but when I got to the Home app, I can lock and unlock my doors without problem.
other times I get
Hmm. I didn't hear back from your lock. You might want to check on it.
but the door unlocks as requested.
I've tried rebooting my router, Apple TV and phone, but still have the problem. I reset one of the locks and re-added it to Home Kit, but that didn't help.
Finally, I downgraded my AppleTV to tvOS 10.2.2 because this is the only non-12 version that Apple is signing. My Schlage locks are working without problem now.