Hello! I understand you're having trouble registering your device with the EU Login app. To help you best, could you tell me a bit more about what's happening? For example:
- Are you trying to link a new device to your EU Login account?
- Are you seeing any error messages or codes during the registration process?
- Have you tried any steps already to solve this, like reinstalling the app or deleting old devices from your account?

This info will help me guide you more precisely. In the meantime, here’s a general approach we can take to troubleshoot device registration issues with the EU Login app on your Windows-based WebKit browser:

1. Check for Previously Registered Devices
Log into your EU Login account via the web and look for any devices already linked to your account. Sometimes an invalid or old device can block new registrations. Removing these devices might be necessary.

2. Clear Browser Cache and App Data
Since you’re on a WebKit-based browser (such as Safari or another that uses WebKit), clear the browser’s cache and cookies. Also, on your device where the app is installed, try clearing the EU Login app’s cache and data or reinstall the app to ensure a fresh start.

3. Follow the Device Registration Steps Carefully
The registration typically involves scanning a QR code from the EU Login web page using the EU Login mobile app or entering a device name and pin code for 2-factor authentication setup. Make sure your mobile app and web page are properly synchronized.

4. Check for Network or Permissions Issues
Ensure that your device has a stable internet connection and that the app has any necessary permissions, such as camera access, to scan QR codes.

If after these steps you’re still not able to register your device, I can guide you through resetting the EU Login app registration or checking account-specific settings.

Would you like me to help you step-by-step with any of these actions? Also, if you have any error messages from the app or account page, please share those—they’re very helpful!