title: Can't find Chromecast serial number to register my device
body: <p>I'm trying to register my chromecast device for development <a href="https://cast.google.com/publish/#/overview" rel="noreferrer">on the console</a> following this guide:
  <a href="https://developers.google.com/cast/docs/registration" rel="noreferrer">https://developers.google.com/cast/docs/registration</a>
   But it seems like its outdated, because when I follow the instructions its " cast this tab" instead of cast.google.com or whatever and the serial number never shows up on the screen.</p>
  
  <p>I also followed the instructions on <a href="https://support.google.com/store/answer/3333000?hl=en-CA" rel="noreferrer">this page</a> and checked my box/device,
  but there was no number on the box and number on the device was extremely faint and didn't work.</p>
  
  <p>So how do I obtain the serial number for my device?</p>
  
  <p>If it's relevant, my firmware version is 38401 and my country code is US (but I'm in Canada)</p>