Can't connect Matter device to Home Assistant

Thanks for your fast answer.

  1. I’m using two separate RaspberryPis. One with the Home Assistant and the other with the OpenThread Border Router which uses a nRF52840 Dongle to make it Thread-capable.

#4 I am aware that it is a Wifi/Matter device. I wanted to try this thinking it might not work with the nRF sample and the Home Assistant. I used a ESP32-C3 device for this but it didn’t work. Sorry for not clarifying that.

#2 I read in another Thread (Another Matter, HA, Eve Window&Door Problem - I surrender - #6 by EmilS) that someone might have solved the mDNS problem by switching out their FritzBox. But I’m not sure if I got that right.
In my device log of the nRF Board there seems to be nothing wrong. This was stated by the Nordic Developers in their Forum-Thread.
Sadly I’m unable to post the log here, as it is too long. But I posted it in