You may encounter “Accessory Not Found” error while trying to pair a HomeKit accessory in Home app. There are some requirements for a HomeKit accessory to be pairable: It’s highly recommened to upgrade iOS device to latest system version A HomeKit accessory can only be paired to a single iOS device There is no problem with bluetooth communication between iOS device and bluetooth HomeKit accessory The iOS device and network based HomeKit accessory must connect to the same router You can checking items below to trouble shooting.