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There could be several reasons why you are getting an empty array as a result when scanning for Bluetooth devices on Android through a Native Module. Here are some possible reasons and their solutions:

1. Bluetooth is not enabled on the device: Make sure that Bluetooth is turned on before trying to scan for devices. You can use the BluetoothAdapter.getDefaultAdapter() method to check if Bluetooth is enabled and turn it on using the enable() method.

2. Lack of necessary permissions: Make sure that your app has the necessary permissions to access Bluetooth on the device. You can request these permissions using the PermissionsAndroid.request() method.

3. Scanning is not being initiated properly: Make sure that you are properly initiating the scanning process using the startDiscovery() method of the BluetoothAdapter. You can also register a BroadcastReceiver to listen for discovered devices.

4. Compatibility issues: Some Android devices may have compatibility issues with certain Bluetooth devices or versions of the Bluetooth standard. Make sure that the device you are trying to connect with is compatible with the device you are using for scanning.

5. Error in code: Check your code to ensure that there are no errors or typos. You can also log the Bluetooth events to see if there are any errors occurring during the scanning process.

   By troubleshooting these issues, you should be able to resolve the problem of getting an empty array when scanning for Bluetooth devices on Android through a Native Module.