Unable to add Matter over Thread Motion Sensor via Nest Hub 2 border router

Update: I'm an idiot. IPv6 was disabled within HA. I'll leave this up for posterity's sake.


Hello, all! I'm having issues trying to connect my new Aqara P2 Matter over Thread Motion Sensor into home assistant. Here's a brief description of my setup:

- Two Nest Hub 2nd Gens to act as border routers

- Matter server installed on Home Assistant

- Nest network set as preferred in HA

I tried both adding it to HA directly out of the box and adding it to Google Home first.

- First attempt directly with HA: Got all the way to "adding to HA" and failed

- Google picked it up first try

- Attempting to share from GH into HA failed to add

- Matter server logs have lines about a UDP connection to an IPv6 address being unreachable, then being unable to commission a node with a websocket error.

Any ideas on where to go from here? Thanks!

Versions

- Matter Server 9.0.3

- HAOS 18, Core 2026.6.4, Supervisor 2026.06.2

- Companion App 2026.6.5 on Android

- Pixel 10 pro XL, Android 16, May security update

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