I'm about to lose it. Can't connect Kajplats for the life of me. Please help.

I bought a bunch of kajplats bulbs only to find out I need a thread border router.

I bought a Google TV Streamer 4K since it works as a thread border router.

I try connecting my devices, it goes all the way to "Checking connectivity to Thread network Google-XYXY". Then they failed.

I thought maybe lets try connecting one in another room where my phone wifi jumps to 2.4ghz instead of 5ghz. It worked, device added. But it shows as offline no matter what I do.

I've spent 200 eur plus now for some god damn smart bulbs to light up my space but I'm this close to just crying. I've spent almost 2 days trying to set this up.

Please for the love of god someone help me.

Devices:

Pixel 7 Pro

Google TV Streamer 4K

Kajplats lightbulbs

ee3301 zyxel router