Pairing Ikea BILRESA with HAOS and Sonoff MG24

Home server running Proxmox, and Home Assistant OS 2026.2.1 in a VM. I’ve just added a dongle for Thread (Sonoff MG24).

Installed OpenThread Border Router app and integration, I see a network in Thread, and Matter says that the status is app.

When I try to connect the device from my Android phone, it says that I need a Thread Border Router.

I thought I identified the issue in IPv6 not working correctly (enabled in proxmox, set the router to assign IPs, in HAOS I see an IPv6 and can use ping6), but no luck.

Anything else I’m missing at this point?