I’m trying to add my first Matter device to HA (container)
After scanning the QR-code the new Matter device was found and successfully connected.
But adding the Matter device to HA failed.
Does anyone have any idea what could be going wrong? Are there any log files that could be analyzed?
Is HA in same network as device and using IPv6?
Not sure, the raspberry with the HA container and the thread border router have IPv4 addresses in the same network. But both are supporting also IPv6. How can I check which IP variant is used by HA?
It looks like you have paired it with a matter network, maybe a Google Matter network.
If you want it paired to HA too at the same time, then you need a share code from the Google Matter network.
The QR code on the device can only be used to pair the device with the first Matter network after a factory reset.
No, I don’t have another network. I use a Tado Bridge X as Thread Border Router and several Matter over Thread devices which I want to add to HA. But without success.
Since you already have devices commissioned on Tado Bridge X as TBR, then you should be able to “Share” it to HA’s Matter Server. Somewhere in the Tado App there should be a way to have it “share” a device which causes it to generate a pairing code. Copy this pairing code, then goto HA UI->Settings->Devices->Add Device, choose Matter and then choose “yes its already in use” then choose “other controller” and it should prompt you to paste the code into the box.
See also
To quote from that thread:
“… add the device to the tado app first. From there it can then be shared with the Home Assistant Matter controller (or any other). This seems to be the intended order of operation (and, in fairness, is also what the “Get started” leaflet asks you to do 
)”
My other devices are no Tado devices but from Nanoleaf and Eve. Tado writes the following about 3rd-party devices:
Adding other Thread-enabled devices to a tado° Thread network
Thread-enabled devices like lights, thermostats, outlets, sensors, and more can be connected to your home network via tado° Bridge X, tado° Heat Pump Optimizer X, or tado° Wireless Receiver X. However, they can’t be controlled via the tado° app. They will need to be controlled either on the vendor’s app or a Smart Home platform.
(see Do I need a tado° Bridge X? | Help Center: tado° X)
I have tried unsuccessfully to add the devices in the Tado app. The app does not recognize the QR code.
