I kept my XAC unused for several months since it seamed broken – I could connect but nothing worked.
I spent a whole day with my Windows 10 VM and nothing – as soon as I connected the XAC to the VM it started a loop of connecting / disconnecting.
So I asked my wife if I could try it on her company’s laptop. It took just a minute, just two notifications and nothing more.
So now the XAC is working fine again with USB connection – I can even use Antimicro to assing keys to each button and use it with Pybricks IDE to remote control the LEGO Top Gear Rally Car with my feet: