HMUserFailedAccessoriesKey
The key for retrieving details of what accessories failed to add or remove a user.
Declaration
let HMUserFailedAccessoriesKey: StringDiscussion
The value associated with this key is an NSArray of NSDictionary objects. Each dictionary contains the NSUUID of the accessory that failed to be added/removed and the value corresponding to the dictionary key is an NSError that provides more details on the underlying error for that accessory.