Okay so I figured out what was going on. I had two micro-usb cords, one was connected to my RaspberryPi and one to my laptop. The issue was with my micro-usb to the RaspberryPi, it was powering the Teensy LC but not reading it.
I switched the cords and it started working on the RaspberryPi.
You can imagine how frustrated I was, given I am new to all this.
Thanks for your help Mitu!