If you are experiencing difficulties with the USPS Mobile app not allowing you to scan barcodes on packages for tracking, follow these actionable steps to troubleshoot the issue:

1. Check App Permissions: Ensure that the USPS Mobile app has permission to access your device's camera. Go to your device's settings, find the USPS app, and check the camera permissions.

2. Update the App: Make sure you are using the latest version of the USPS Mobile app. Open the App Store, search for USPS, and see if an update is available. Install any updates.

3. Restart Your Device: Sometimes, restarting your device can resolve temporary glitches. Power off your device completely and then turn it back on.

4. Clear App Cache: If you are comfortable doing this, clear the cache for the USPS app. Go to your device's settings, find the USPS app, and clear the cache.

5. Reinstall the App: Delete the USPS app from your device and reinstall it from the App Store. This can resolve various issues that might be causing the app to malfunction.

6. Contact Support: If the issue persists after trying the above steps, contact USPS technical support. You can reach them at 1-800-344-7779. Be prepared to provide details about your device and the issues you're experiencing. Calling may lead to quicker assistance since this has been a recurring problem for some users - learn more.

7. Check Online Resources: Visit the USPS tracking FAQ page for more insights and solutions related to tracking and scanning issues. This might provide additional context or updates on known problems - learn more.

By following these steps, you should be able to determine the cause of the scanning issue and resolve it effectively. If none of these methods work, there may be a broader issue with the USPS service itself that they are working to fix.