HomeKit integration - can't add HA as bridge to homekit


Looking for help to get HomeKit integration working please.

I have a fresh install of Home Assistant running in docker, on a server in it’s own vlan eg /24.
Here’s the version info:

Home Assistant 2023.4.2 
Frontend 20230406.1 - latest 

I’ve added HASS Bridge integration and tried to add the bridge to HomeKit on my iPhone. The process on the iPhone fails after a few minutes, with error “Accessory Not Found”
iPhone is on user vlan eg 10.10.30.x /24.

Firewall rules allow bidirectional traffic between server and user vlans.

I can provide json if needed.