Hi there! I understand you're having trouble logging into the Lufthansa app and website on your Android 13 device. Let's work through this together to get you back in.

First, could you tell me if you’re seeing any specific error messages when you try to log in? Also, have you been able to log in successfully before, or is this your first time trying?

In the meantime, here are some steps we can try to troubleshoot:

1. Clear the app cache and data:
- Go to your phone’s Settings > Apps > Lufthansa app.
- Tap on Storage.
- Select "Clear Cache" and then "Clear Data."
- Restart the app and try logging in again.

2. If you’re using a web browser, clear the browser’s cache and cookies:
- Open your browser’s settings menu.
- Find the option to clear browsing data.
- Select cache and cookies, then clear them.
- Try logging in again.

3. Make sure your app is updated to the latest version via Google Play Store.

4. Use the “Forgot password” option on the login page to reset your password, just in case the issue is password-related.

5. Check your network connection to ensure it’s stable, switching between Wi-Fi and mobile data to see if that helps.

If none of these steps work, sometimes there can be temporary technical issues on Lufthansa’s side, so it’s good to check if others are experiencing similar problems. I found recent reports mentioning login issues for multiple users, so this might be related to a service glitch.

Let me know what you’ve tried so far or any error messages, and I’ll help you with the next steps!