Hello! I see you're encountering the Singapore Airlines app error code B0999. To help you better, could you please tell me what action you were trying to perform when this error appeared? For example, were you signing up for KrisFlyer, logging in, booking a flight, or something else?

Meanwhile, based on previous reports, error B0999 sometimes occurs when users sign up for KrisFlyer accounts, and it has been linked to issues with certain browsers or VPNs.

Here’s a step-by-step approach that often helps resolve this issue on Windows using WebKit-based browsers:

1. Try a Different Browser: Sometimes the error is browser-specific. Since you’re on a WebKit-based browser, you might try using Microsoft Edge or another browser like Firefox or Chrome to see if the error persists.

2. Disable VPN or Proxy: If you have a VPN (such as Surf Shark) or any proxy enabled, temporarily disable it. VPNs can occasionally interfere with the app’s connection to the Singapore Airlines server.

3. Clear Browser Cache and Cookies: Clearing stored website data can remove corrupted details that block proper login or sign-up.

- In your browser, go to Settings > Privacy > Clear Browsing Data.
- Choose to clear cached images and files, as well as cookies.

4. Update Your Browser: Make sure your browser is updated to the latest version, as outdated versions can cause compatibility issues.

5. Restart Your Device: Sometimes, a simple reboot can resolve temporary software glitches.

If these steps don’t solve the problem, please let me know more about what you’re trying to do when you get the error, and we can investigate further or escalate if needed.

Are you satisfied with the solution I have provided so far?