Cannot add IKEA Kajplats (matter) led bulbs?

TB-DK · January 20, 2026, 4:40pm

Hi

I just bought the Connect ZBT-2, But i can not connect, my IKEA Kajplats (matter) led bulbs?

Every time i scan them with home assistant matter or google home or type in the connection code, my phone say, your device needs a thread-border router?

System:
Server = Intel NUC / HA
Phone = Google Pixel 7 / Android 16
Thread = Connect ZBT-2 / Thread
Wifi = Orbi RBR20 / Mesh 2.4 GHz
Zigbee = Sonoff ZBDongle-E

Fischermaen · January 23, 2026, 3:33pm

Did you install the addon Open Thread Border Router? You need at least one border router to add devices to a thread network.

TB-DK · January 25, 2026, 3:30am

Yes Open Thread Border Router, Matter and Matter server is installed.

Fischermaen · January 25, 2026, 1:20pm

Did you setup the border router giving it the ZBT-2 stick (similar to this)

TB-DK · January 26, 2026, 11:10am

Except for the device name?
/dev/serial/by-id/usb-Nabu_Casa_ZBT-2_DCB4D91014C4-if00

TB-DK · January 31, 2026, 5:46am

Thanks for the help i reinstalled all the add-ons and started all over, and now it works

tommyp100 · March 23, 2026, 8:22pm

Had same problem - sorted by Settings > Companion app > Troubleshooting and select Sync Thread credentials. Once Synced it all worked perfectly and Kajplats paired fine with ZBT-2

Geoff571 · March 30, 2026, 5:49pm

I have to admit that after many attempts to get both Ikea bulbs and 2 button switches into HA under Matter I have given up, they all failed at the pairing step. I reset them all into Zigbee mode and happily added them to my existing Z2M config.