I have a strange issue on some hp elitebook 840 G3 in my business. I don't understand the problem but some elitebook cannot use miracast because appear message "you device doens't support miracast" when i try use connect button in Windows 10. But in the past it worked. I already updating OS, wireless drivers and bios but this not fix the problem. Also, if i run the command "netsh wlan show driver" appear
My PC is hardwired and does not natively have wifi so I had the same issue as OP. Once I plugged in the adapter and downloaded the drivers, I was able to easily project to and from this PC. I DID NOT have to connect to wifi to use the miracast feature. I was able to stay hardwired the entire time I was using miracast features. This leads me to conclude that the T2U Nano does support miracast. Hope that helps.