Nanoleaf Bulbs and HomeKit

I have 2 Nanoleaf essential bulbs. They are installed and updated to latest firmware. They are active in the Nanoleaf app and work as expected, when used from the Nanoleaf app. I can add them Matter Apple HomeKit from within the Nanolead app and they appear in my Apple Home app assigned to the associated rooms.

However, despite both bulbs working as expected in the Nanoleaf app, in the Apple Home app both bulbs so 'No Response'.

I have done checked all devices are running latest firmware, conducted several factory resets, deleted and re-added both bulbs to both apps, removed any special characters from my home Wi-Fi network name and reset my router and Wi-Fi extenders.

Has anyone had similar issue and can recommend a fix?

• Check that the device that you set up as a home hub is in your home, connected to your home Wi-Fi network, and powered on.

My Apple TV 4K is acting as Home Hub, could it be the issue if hardwired to network and no connected to home wi-fi, as recommended by Apple?