Tado X - Unable to add Matter devices

[msavazzi]

The problem

I've moved to Tado X - they should be Matter enabled.
I have a Tado X bridge and several The Smart Radiator Thermostat X, Smart Thermostat X
I've configured them with the Tado App and they are connected.
As explained in the documentation from Tado and for Matter I've opened the Tado app, under the specific device there is the option Device Linking with the matter logo. It generates a code.
The same code should be used to add the device to the matter integration but I end up always with an error.
(Matter -> Add Device -> Yes is already in use -> Other controller -> Enter Setup Code)
The bridge as well as HA are in the same network, everything updated.
Note that the tado X bridge is the Thread Preferred Network

What version of Home Assistant Core has the issue?

core-2024.12.5

What was the last working version of Home Assistant Core?

No response

What type of installation are you running?

Home Assistant OS

Integration causing the issue

Matter

Link to integration documentation on our website

https://www.home-assistant.io/integrations/matter

Diagnostics information

No response

Example YAML snippet

No response

Anything in the logs that might be useful for us?

No response

Additional information

No response

[home-assistant]

Hey there @home-assistant/matter, mind taking a look at this issue as it has been labeled with an integration (matter) you are listed as a code owner for? Thanks!

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[msavazzi]

In the log I only have 8 groups of lines like:

2024-12-28 12:39:03.595 (MainThread) INFO [matter_server.server.device_controller] Starting Matter commissioning with code using Node ID 1.

2024-12-28 12:39:03.988 (Dummy-2) CHIP_ERROR [chip.native.DL] Long dispatch time: 246 ms, for event type 2

2024-12-28 12:39:05.043 (Dummy-2) CHIP_ERROR [chip.native.-] src/inet/UDPEndPointImplSockets.cpp:416: OS Error 0x02000065: Network is unreachable at src/controller/SetUpCodePairer.cpp:280

2024-12-28 12:39:33.987 (Dummy-2) CHIP_ERROR [chip.native.CTL] Discovery timed out

2024-12-28 12:39:33.987 (Dummy-2) CHIP_ERROR [chip.native.ZCL] Secure Pairing Failed

2024-12-28 12:39:33.989 (Dummy-2) WARNING [chip.ChipDeviceCtrl] Failed to establish secure session to device: src/controller/python/ChipDeviceController-ScriptDevicePairingDelegate.cpp:89: CHIP Error 0x00000003: Incorrect state

[msavazzi]

For your info I've cross checked and enabled IPv6 on the network. HA and the Matter Bridge are on the same network both as IPv4 as well as IPv6

[msavazzi]

I've checked with apps like EVE and Matter Utilities and I can see the different devices.
In EVE I can add the device with no problem