I had faced similar situation and had given up. But this time it worked. Important if doing on android phone keep usb debugging on or choose file transfer on USB hook up.
Use good quality data cable. Attach it to the middle USB in the panel. Extreme right is for charging only I think which has aux too.
In the glove compartment remove any device from the cable.
Then try.
May be my system got updated twice, it started working with mirroring. The HU prompt asked me to install EasyConnection from play store.