Ensure that your smartwatch is powered on and Bluetooth is enabled on your phone. Launch the Wear OS by Google App and follow the on-screen instructions for pairing your watch. If it fails to connect, check the Bluetooth menu on your phone. If you see the smartwatch in the device list, remove it. Launch the Wear OS by Google App and repeat the pairing process.
If you are still having issues, click here for troubleshooting tips.