Hello. I would appreciate it if you could kindly help to solve this problem. Thank you very much!
I have already filled in the relevant information in the feedback assistant and uploaded the sysdiagnose file:
-- FB17317942
please file a bug describing what happened
--When using our app to scan the QR code for adding a Thermostat (Matter Over Thread), an error occurred, stating: "Unable to Add Accessory".
what time the failure occurred
--2025-4-22 16-17 GMT+8
What system versions have you tested with/seen this on?
--iOS 18.4.1
Can you provide more details about what you're controller configuration you're testing with? What's the pairing device (the device you're using the pair UI on), is there a Home Hub, and device(s) are acting as the bridge to Thread?
--We don't have a Home Hub. Instead, we're using our own Matter Controller, which is also a Thread Border Router, and our Thermostat that works with Matter Over Thread.
What's the ratio of success/failure when pairing?
--When the network's good, the success rate's really high. Nine out of ten attempts are successful, and there's just one failure.
--When the network's bad, the success rate's really low. Nine out of ten attempts are failures, and there's only one success.
Our software development environment:
MacOS 15.3.2
Xcode 16.2
iOS 18.4
Dart 3.4.1
Flutter 3.22.1
Matter Controller(Matter1.3)
Thermostat(Matter1.3)