Hi Xee, did you ever get this working?
I have the exact same setup as you (Unraid hosting docker of HA and docker of matter-server, both installed from Unraid app store.
And I am unable to add matter devices to HA, despite ipv6 being turned on etc.
The devices add just fine via the Google Home app, but I cannot share them either to HA.
The log on the matter-server docker reads like this:
2024-06-08 10:31:51.299 (MainThread) ERROR [matter_server.server.client_handler] [22591129297168] Error while handling: commission_with_code: Commission with code failed for node 12.
2024-06-08 18:25:31.834 (MainThread) INFO [matter_server.server.device_controller] Starting Matter commissioning with code using Node ID 13 (attempt 1/3).
2024-06-08 18:26:01.835 (Dummy-2) CHIP_ERROR [chip.native.CTL] Discovery timed out
2024-06-08 18:26:03.726 (Dummy-2) CHIP_ERROR [chip.native.EM] Failed to Send CHIP MessageCounter:42379508 on exchange 62780i with Node: <0000000000000000, 0> sendCount: 4 max retries: 4
2024-06-08 18:26:08.335 (Dummy-2) CHIP_ERROR [chip.native.SC] PASESession timed out while waiting for a response from the peer. Expected message type was 33
2024-06-08 18:26:08.335 (Dummy-2) CHIP_ERROR [chip.native.ZCL] Secure Pairing Failed
2024-06-08 18:26:08.336 (Dummy-2) WARNING [root] Failed to establish secure session to device: src/controller/python/ChipDeviceController-ScriptDevicePairingDelegate.cpp:89: CHIP Error 0x00000003: Incorrect state
2024-06-08 18:26:08.336 (Dummy-2) WARNING [root] Failed to commission: src/controller/python/ChipDeviceController-ScriptDevicePairingDelegate.cpp:89: CHIP Error 0x00000003: Incorrect state