Hi there! I understand you're having trouble logging into your Mein NIAG Abo account, which is preventing you from using your ticket. Let's get this sorted out for you.

First, could you please tell me if you see any error message when you try to log in? Also, have you attempted to reset your password or check if your internet connection is stable?

In the meantime, here are some steps you can try on your Android 10 device with the WebKit browser:

1. Check Internet Connection: Make sure your device has a stable internet connection, either via Wi-Fi or mobile data.

2. Clear Browser Cache and Cookies: Sometimes stored data can interfere with login. Go to your browser settings, find the option to clear browsing data, and clear cache and cookies.

3. Update the Mein NIAG Abo App: If you are using the mobile app rather than the browser, check the Google Play Store for any updates to the Mein NIAG Abo app and install them.

4. Try Logging in via the Official Website or App: Use the official Mein NIAG Abo app or the NIAG website app section to log in. Here is the official app link for your reference: Mein NIAG Abo on Google Play

5. Reset Your Password: If you forgot your password or suspect it might be incorrect, use the 'Forgot Password' feature on the login page to reset it.

If you've tried these steps already or if there’s a specific error message, please let me know so I can assist you further.

Are you satisfied with the solution I provided so far?

I see an error message when I try to log in, it says: "Der Server ist nicht erreichbar. Bitte versuche es später erneut"

Thank you for sharing the exact error message: "Der Server ist nicht erreichbar. Bitte versuche es später erneut," which means "The server is not reachable. Please try again later."

This indicates that the app or website is having trouble connecting to the NIAG servers at the moment. Here are some steps to help you troubleshoot this issue:

1. Check Your Internet Connection: Make sure your Android device has a stable internet connection. You can try switching between Wi-Fi and mobile data to see if that helps.

2. Restart Your Device: Sometimes, restarting your phone can resolve temporary network glitches.

3. Check for Server Status Updates: Occasionally, server maintenance or outages happen. Since I don't have details on current server status, I recommend checking NIAG's official website or social media channels for any announcements about service interruptions.

4. Clear App Cache and Data: If you're using the NIAG Abo app, try clearing its cache and data:
- Go to your device's Settings > Apps & notifications > See all apps > Find the NIAG app.
- Tap on Storage & cache.
- Select Clear cache and then Clear storage/data.
- After that, try logging in again.

5. Update the App: Ensure that the NIAG app is updated to the latest version from the Google Play Store.

6. Reinstall the App: If clearing cache didn't work, uninstall the app entirely and reinstall it.

If after trying these steps you still get the same error, it might be a server-side issue that only NIAG can resolve. In that case, please wait a bit and try again later.

Would you like me to help you with any of these steps? Or do you need assistance contacting NIAG support directly? Let me know!