Overbridge - A4mk2 - not connecting in overbridge mode

Is there any other setting on the device or PC that would affect Overbridge other than what’s in the user manual?

I’ve installed overbridge and checked Global > System > USB CONFIG > OVERBRIDGE

I’ve tried different usb ports direct into my pc as well as reinstalling a few times.
It’s not autoselecting it via the vst or control panel - so i can’t use it as a VST to split out the channels etc…

any ideas?