I'll have to try this with a Pi2, I only have Pi3s handy at the moment. With a Pi3, the onboard Wifi gets "split" during that initial pairing process. So there is a chance that a USB wifi won't work. Just to be clear, if you use a laptop or a phone and pull up the list of available Wifi networks, you don't see a network called "MYCROFT" -- correct?
As a work around you can either of two things to get this going:
Plug the unit in using Ethernet.
We just need a network connection, it doesn't have to be Wifi.
Manually configure the wifi.
It isn't too difficult if you have the Pi2 plugged in to a keyboard and HDMI monitor:
- Hit Ctrl+C to get to the command line
sudo nano /etc/wpa_supplicant/wpa_supplicant.conf
- Arrow-key down to the bottom of the file and enter something like this:
(of course, use your own SSID and password )
- Hit Ctrl+X to exit and Y,Enter to save your change.
sudo reboot now
Let me know if this works for you!