If you’re facing issues with Facebook Messenger, particularly with messages not being delivered, you can try the following troubleshooting steps:

1. **Check Internet Connection:**
– Ensure that your device has a stable internet connection.

2. **Update Messenger:**
– Make sure you are using the latest version of the Messenger app. Outdated versions may have bugs that have been fixed in newer releases.

3. **Restart the App:**
– Close the Messenger app and reopen it. This can help resolve temporary glitches.

4. **Restart Your Device:**
– Sometimes, restarting your device can resolve various issues, including those with messaging apps.

5. **Check App Permissions:**
– Confirm that Messenger has the necessary permissions to access your device’s network and storage.

6. **Clear Cache (Android):**
– On Android devices, you can try clearing the app cache in the device settings.

7. **Reinstall the App:**
– If the issue persists, uninstall the Messenger app and then reinstall it from the app store.

8. **Update Device Software:**
– Ensure that your device’s operating system is up-to-date.

9. **Check Message Recipient’s Settings:**
– Verify that the person you’re trying to message hasn’t blocked you or changed their settings to limit incoming messages.

10. **Contact Facebook Support:**
– If none of the above solutions work, you may need to contact Facebook support for further assistance.

Remember to back up any important messages before uninstalling the app, as reinstalling it may result in data loss.