Can't Add Thread Devices to Home Assistant

Configuration Matter/Thread
1

A little background. I have been running Home Assistant alongside SmartThings for about 18 months. Originally I was running HA in a virtual machine on a Windows computer. About 3 months ago I moved HA to a dedicated Beelink Mini computer running HAOS. When Samsung Announced there paywall I decided to move everything to HA. So I have moved Z-Wave, ZigBee, Matter over Lan, Matter over WiFi, and Local WiFi devices over to HA with minimal problems. I also have BLE running on HA.

My Problem is Matter over Thread. I can not add any Matter over Thread devices to HA. I have 2 TBRs a SmartThings Station (Preferred Network) and an Amazon Echo 4th Gen. When adding them to HA it fails at the final step “Connecting to HA”

I have tried different 3 ways to bring Thread devices into HA.

  1. Directly adding them to HA, and HA picks the ST TBR which fails.
  2. Add it to SmartThings then try Multi-Admin to bring it into HA which fails.
  3. Add it to Alexa then try Multi-Admin to bring it into HA which fails.

I tried pairing the devices in varior areas of the house including within inches of the TBR with no luck.

Thread devices work just fine in SmartThings, and Alexa, so I don’t think it is a network problem.

4 to 6 weeks ago I was able to bring 4 Matter over Thread devices into HA from SmartThing using Multi-Admin, but they went dead after a few days. So I deleted the dead devices in HA and forgot about it. Now that I have everything else moved from ST to HA I circled back to Thread with no luck.

I have rebooted HA, WiFi router, both TBRs with no change.

I have deleted and readded the Thread integration several times.

When I click the info. button in Thread I get the following info:
Network name: ST-0BQJ
Channel: 19
Dataset ID: [REDACTED]
PAN ID: cda9
Extended PAN ID: f4ffb6916a0ab880

HA details:
Installation method Home Assistant OS
Core 2026.8.1
Supervisor 2026.07.5
Operating System 18.2
Frontend 20260729.6

2

Did you manually enable IPv6 forwarding in the HA Terminal by

“ha docker options --enable-ipv6=true” ?

Then restart HA. You have to enable that manually.
And no, it has nothing to do with HA running in a docker or not.

3

Thanks for the reply.

I just did that and I am see no change.

  1. I tried to commission a new bulb and it failed. Says something went wrong.
  2. I tied to connect to a device installed in SmartThings by Multi-Admin and it failed. It just circles back and wants me to re-add the code.
4

I just made a physical change and I was able to add a Nanoleaf Bulb. I move my TBR closer to my HA mini computer and where I was pairing.

Thanks again for your help.

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