To address the issue of your VeSync app connecting to your scale device but not updating the weight data, follow these step-by-step troubleshooting steps:

1. Check the Scale Model: Ensure that your scale is indeed a smart bodyweight scale compatible with the VeSync app. Non-smart models cannot connect and sync data - learn more.

2. Open the VeSync App: Before weighing yourself, start the VeSync app on your device. The app typically needs to be open for it to sync the data correctly after measuring - learn more.

3. Confirm Measurements: After weighing yourself, confirm the weight in the VeSync app. Only confirming the measurement allows the data to sync with connected applications such as MyFitnessPal - learn more.

4. Reconnect Bluetooth: Check the Bluetooth connection between your scale and the app. If it’s disconnected, try turning off Bluetooth on your device and then turning it back on. Reconnect your scale by following the connection steps again.

5. Remove Batteries: If the problem persists, remove the batteries from the scale for about 60 seconds and then reinstall them. This can help reset any temporary glitches that may be affecting functionality - learn more.

6. Ensure No Other Connections: Make sure the scale isn’t connected to any other device or application concurrently, as this may interfere with the sync process - learn more.

7. Force Quit and Restart the App: If the above steps do not resolve the issue, force-quit the VeSync app and restart it. This can clear up temporary errors that may be causing the syncing issue - learn more.

8. Check for App Updates: Ensure that the VeSync app is up to date. Outdated versions may have bugs that can cause syncing errors. Update the app through the Microsoft Store or directly from the app.

9. Reinstall the VeSync App: If all else fails, uninstall and then reinstall the VeSync app to reset it completely. Be sure to back up any important data if needed.

10. Contact Support: If you've followed all these steps and still experience issues, consider reaching out to VeSync customer support for more assistance.

Following these steps should resolve the syncing issue between your scale device and the VeSync app, allowing for proper weight data updates.