To cast from one device to another they both have to be on the same WiFi network.

Cast from your computer:

  1. Open Google Chrome

  2. Click the three dots in the top right corner.

  3. Click Cast...

  4. Choose the device you want to cast to.

Cast from your Android device:

  1. Open the Google Home application

  2. Choose the unit you want to cast to.

  3. Click Cast my screen -> Cast screen.

Read more https://support.google.com/chromecast/answer/3228332

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