Home Assistant border router issue

I have just setup my Skyconnect and got it set for multiprotocol, but I cannot add my matter over thread Onvis devices directly to Home Assistant. I have also tried to add VIA Smartthings, and it finds my Home-assistant border router, but when I click it, is asks for a 32 character network key. I’m not sure where to find this key.
Thanks to all in advance to anyone willing to answer a probable noob question on the matter.

The same Problem occurs to me.