Lost my Thread network credentials?

Configuration Matter/Thread
1

I am running:

  • Home Assistant OS 14.2 with Home Assistant Core 2025.3.3
  • Home Assistant Companion App 2025.2
  • Home Assistant Connect ZBT-1 (configured for Thread)
  • Open Thread Border Router (configured for the ZBT-1 mentioned above)
  • Thread integration (with the Open Thread Border Routing mentioned above being the preferred network)
  • Matter integration showing 7 Matter devices connected through the Matter-over-Thread network and 9 devices connected though a Matter-over-Wifi network (2.4 GHz)

I just wanted to add a new Matter-over-Wifi devices using the “Add matter device” functionality of the HA Companion App as I did many times before. Surprisingly, this time I received an error message (in German) basically saying “Failed to save Thread network credentials. Error: Thread network credentials does (sic!) not match with any of the active thread networks around.”

I checked at “Companion App → Debugging → Thread” in my HA Companion App, and indeed there were no Thread credentials stored anymore. I tried to “send credentials to phone” from the Thread integration but get the said error message.

This leads me to the following questions of which I hope someone of you can help me with:

  1. Where did my Thread credentials go and what can I do to make HA find them again?
  2. This question might be unrelated but here we go: The device I wanted to add was a Matter-over-Wifi device. Hence, I wasn’t planning to add something to the Thread network anyway. I could skip the error message but wasn’t eventually able to add the Matter-over-Wifi device. The Thread credentials are only needed for Matter-over-Thread devices, right?
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2

Your situation is very bizarre. I have not seen anything like this before from anyone else.
May be worth posting an issue here.

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