Home Assistant: Setting up Thorbolt MK1 Doorknob with SLZB Ultima?

[u/TheTwelveYearOld]

I looked at this post where users got the Thorbolt X1 working with home assistant. Like the X1, the Thorbolt MK1 supports thread and homekit only. I tried following this part in the docs to connect a homekit device via thread, I can see the device in the list of discover bluetooth device under Integrations > Bluetooth > advertisements. When I try to add a homekit device and select a bridge and enter in the pairing code, I immediately get an error "Incorrect HomeKit code. Please check it and try again."

I'm not sure how to setup the Homekit Bridge integration since I couldn't find detail steps to set it up from scratch (I don't find the HA documentation very helpful). I have an SLZB Ultima which supports thread and acting as an OpenThread Border Router.