Pixl.js NFC does not want to work

I recently got a Pixl.js and a Puck.js

NFC is working fine on my puck.js but I can't get it working on my pixl.js.

This is my code:

NRF.nfcURL("http://espruino.com");
NRF.on('NFCon', () => LED1.write(true));
NRF.on('NFCoff', () => LED1.write(false));

I've tried:

• resetting the pixl
  
• hard resetting the pixl
  
• jamming the phone right up to the chip
  
• battery vs usb connection
  
• NRF.nfcURL() followed by NRF.nfcURL('https://google.com')
  
• disconnecting from the web ide
  
  

Am I doing something wrong or could my pixl be broken? :(