Hi there! I see you're having trouble logging into the MSC app on your iPhone. I’d love to help you get that sorted out. To start off, could you tell me if you are seeing any error messages when you try to log in? Also, are you logging in with your booking number or an email and password?

Meanwhile, here are some common steps to try that often resolve login issues with the MSC app:

1. Make sure the app is fully updated. Go to the App Store and check for any updates for the MSC app.
2. Restart your iPhone to clear any temporary glitches.
3. Try logging in using your booking number rather than an email, as sometimes that works better for MSC accounts.
4. If you continue having issues, uninstall the MSC app entirely and reinstall it. This can fix app corruption or outdated data.
5. Check your internet connection on your iPhone—WiFi or cellular data should be stable.
6. As a last step, try logging in via the MSC website through your browser to confirm your credentials are working.

If you tell me what you’ve tried and what specific problem or error you see, I can guide you further with steps tailored to your situation!