White switch setup / pairing problems

I have tried pairing a new white switch with both Smartthings and Apple home.

Multiple factory resets.
Every time, it fails. I have tried scanning the code and entering the number manually.

It works as a switch in the 3-way circuit and is wired correctly.

I have a Unifi network, all devices are on the same network (i.e. I don’t have a separate VLAN for iot stuff, etc).

I have tried everything I can find with searching Reddit and Inovelli’s site … any suggestions?

I removed this switch and wired in my second white switch. I was able to get it to pair with Smartthings, but Apple home will not recognize it. In Smartthings, it seems to have limited functions - i.e. I cannot set alerts to the LED strip, etc. I have installed the drivers to Smartthings.

I am at a loss as to what to do next…

Thanks in advance.

Is the blue light on the LED bar pulsing when you are trying to commission the switch? Or does iOS never get past “Connecting…” in the pairing flow?