If you are experiencing issues with the Wizz Air app not proceeding after entering your passport details, follow these steps to troubleshoot and resolve the problem:

1. Verify Passport Details: Ensure that all the passport information you entered is correct. Double-check for typos in details such as the passport number, expiration date, and name.

2. Check Internet Connection: Make sure that your device has a stable internet connection. Sometimes a poor connection can prevent the app from processing your input properly.

3. Restart the App: Close the Wizz Air app completely and restart it. This can help clear any temporary glitches.

4. Update the App: Check for any available updates for the Wizz Air app in your app store. An outdated version might be causing the issue.

5. Clear App Cache (If Applicable): If your device allows, clear the app's cache. This can resolve issues related to corrupted data.

6. Use a Different Browser: If the issue persists, try using Google Chrome or another compatible browser on a computer or laptop. This can sometimes provide a more reliable experience than a mobile app - learn more.

7. Check for Server Issues: Occasionally, Wizz Air’s servers may be down or experiencing issues. Check their official website or social media channels for any announcements regarding service disruptions.

8. Contact Customer Support: If none of the above steps resolve your issue, consider reaching out to Wizz Air customer support for assistance. They may provide insights or updates regarding ongoing technical issues - learn more.

9. As a Last Resort, Use Airport Check-in: If online check-in is unavailable or fails continuously, proceed to the airport for check-in at the counter, where you can present your travel documents - learn more.

By following these steps, you should be able to troubleshoot the issue with the Wizz Air app and continue with your check-in process smoothly.