Hi thanks for helpful information.
Pairing your phone to the web
1. Open Google Messages on your Android phone
2. Tap the vertical three dots “More” options icon at the top right
3. Select “Device pairing”
4. Tap the “QR code scanner” button in the middle of the screen
5. Point your phone camera at your Chromebook screen to capture the QR code for Google Messages
6. Close the Google Messages app on your phone and continue on your Chromebook