Hi there! I understand you're seeing a white screen every time you try to log into the MyID app on your iPhone. Let’s get this sorted out for you. To help me understand better, have you tried any steps already like restarting the app or your phone? Also, is your iPhone’s iOS updated to the latest version?

Meanwhile, here’s a simple step-by-step to start fixing this:

1. Close and Restart the MyID App: Double-tap the Home button or swipe up (depending on your iPhone model) to bring up the app switcher, then swipe the MyID app off the screen to close it completely. Open it again and try logging in.

2. Restart Your iPhone: Sometimes a simple reboot resolves temporary glitches. Hold the power button and slide to power off, then turn your phone back on.

3. Check Your Internet Connection: Make sure your iPhone is connected to a stable Wi-Fi or cellular network.

4. Update the MyID App and iOS: Go to the App Store to see if there’s an update for MyID. Also, check your iPhone’s settings under General > Software Update for any iOS updates.

If these basics don't fix the issue, the problem might be linked to app caching or a deeper iOS-web compatibility glitch.

Next, you can:

5. Clear MyID App Cache or Reinstall App: Since iOS doesn’t provide a direct cache clear, uninstall the app by holding its icon and selecting ‘Delete App’, then reinstall it fresh from the App Store.

6. Check any VPN or Proxy Settings: Sometimes VPNs can interfere with app connections, so disabling them temporarily while logging in could help.

If the white screen persists after this, it may be helpful to note if it happens only on your iPhone, or other devices as well (like your Windows machine). Also, since you’re on Windows with the WebKit browser, does logging into MyID there work fine, or do you have similar issues? This will help isolate if it’s specific to the iPhone app.

Let me know what you’ve tried so far or if you want me to guide you through any of these steps in more detail!