Connection Nuki Ultra to HA over Matter

Want to connect my NUKI Smart Lock Ultra to HA over Matter/Thread as well. HA is running on RPi 5 with ZBT-1 (flashed with OpenThread RCP 2.4.4.0 firmware). Addons Matter Server and OpenThread Border router are installed and running. The HA OpenThread Border Router is set as my preferred network.

I’m struggling getting the connection done via an Android device while activating Matter in the Nuki app. It breaks saying it cannot connect the device and I should check if my phone is connected to the WiFi. However my phone is connected to the WiFi!!! I’ve already raised a ticket at the Nuki support.

Though I’m asking here for some advice because I’m reading it’s quite challenging to manage the commissioning when you have Nest hubs at home and you want to synchronize the thread credentials on the Android phone.

I read something interesting in here. No phone, no bluetooth, but WebSocket in Chrome…
https://developer.nuki.io/t/smart-lock-4th-generation-set-up-home-assistant-for-remote-access-via-thread/25181/83

That’s what I try but it fails as well. The Matter Server log says

2025-05-30 17:47:07.003 (MainThread) ERROR [matter_server.server.client_handler] [548415136464] Error while handling: commission_with_code: Bluetooth commissioning is not available.

But it’s bluetooth and I understood it should work without bluetooth. Any idea how I succeed? Do I need to setup WiFi via the Nuki app before?

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