If you are encountering a "User Not Found" error in the Deco My Tree app, there are several troubleshooting steps you can follow to resolve the issue:

1. Check Your Internet Connection: Ensure your device is connected to the internet. If you're on a Wi-Fi network, switch to mobile data or vice versa to see if the issue persists - learn more.

2. Reboot the Deco Device: Sometimes, the Deco device may need a restart to refresh the network connections. Power off the Deco and wait for about 10 seconds before turning it back on - learn more.

3. Disable VPN and Mobile Data: Make sure that any VPN services are turned off, as they can interfere with the app's ability to recognize your user account. Also, disable mobile data temporarily to see if it resolves the issue - learn more.

4. Log Out and Back In: Try logging out of your account in the Deco My Tree app and then logging back in. This can refresh your session and may fix the user not found error.

5. Check for App Updates: Make sure that you are using the latest version of the Deco My Tree app. Go to the app store on your device and look for any available updates.

6. Reinstall the App: If the problem persists, uninstall the Deco My Tree app from your device and then reinstall it. This can help reset any corrupted files or settings causing the issue.

7. Check App Permissions: Ensure that the app has the necessary permissions to access your device's operating features, which can affect its functionality.

8. Consult Community Forums: If none of the above solutions work, consider visiting forums or communities related to Deco My Tree for additional help. For example, Reddit has discussions regarding similar issues - learn more.

9. Contact Support: If the problem remains unresolved, reach out to the Deco My Tree support team for direct assistance. They may have more specific instructions tailored to your situation.

By following these steps, you should be able to troubleshoot and potentially resolve the "User Not Found" error in the Deco My Tree app.