[ZBT-1] No active Thread network found but Thread works? Try this!

Configuration Matter/Thread
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Hi everyone, I was about to create a bug report, but when I was gathering all information, I was able to solve the issue myself :smiley:

Thought I just drop the necessary information here if someone encounters the same issue.

My setup

  • HAOS 16.3 on ODroid M1
  • Core 2025.12.2 (issue was there at least already on 2025.12.1)
  • Supervisor 2025.12.3
  • Frontend 20251203.2 / Companion App 2025.12.1 (2025.1546)
  • Thread Border Router: Open Thread Border Router (OTBR) AddOn with ZBT-1

The issue

Existing Matter-over-Thread devices were working just fine. My motion sensors were triggering automations for Matter-over-Thread, Shelly WiFi and WLED lights. My Matter-over-Thread smoke sensors were online. My Eve Energy Outdoor was providing real-time data.

But I was not able to add new Thread devices. The Thread integration showed a known network with the correct name (the same as the Matter-devices showed under their device pages), but stated that there would be no Border router found. When trying to add a new Matter device, I got an error somehow (roughly translated from German) like this:

Error for saving credentials for Thread-Network, Error: Thread network credentials does not match with any of the active Thread networks around. The login information for the Thread network could not be saved.

I was able to click “continue”, but I could not add new devices because “Pairing Failed”. When trying to add a Matter-over-Thread device to Apple Home (which worked fine before), it tried to connect but failed with:

Thread Border Router Required. To connect this device, you need a Thread Border Router in your private network.

The solution

Under Settings, Hardware I have an image of the ODroid-M1 at the top and a CPU / RAM usage graphs at the bottom. In between is a button “Home Assistant SkyConnect (Configure)”. By clicking on it, you get ask whether you want to migrate your ZigBee or Thread network to a new radio adapter. Originally I just wanted to see where this leads, but by clicking “Migrate Thread to a new adaptor (By this, your Thread Border Router is migrated to a new device)”, it started off some update process (re-installing firmware?), which eventually solved my problem.

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