Hello! I understand you're having trouble with invalid login codes sent to your email address for MapXplorer. To better help you, could you tell me if the codes are not arriving at all, or are you receiving them but they get rejected as invalid when you try to use them? Also, are you using email to log in, or is this related to a password reset or two-factor authentication code?

Meanwhile, here are some initial steps you can try on your iPhone (iOS 18.7):

1. Check your email inbox and spam/junk folder carefully to see if the login codes are arriving there but getting missed.
2. Ensure the email address you enter in MapXplorer matches exactly your registered email; even small typos could cause invalid code errors.
3. Try requesting a new login code or password reset—sometimes codes expire quickly or there's been some delay.
4. Restart your iPhone and try the entire login process again. This can clear network or app glitches.
5. Make sure your MapXplorer app is updated to the latest version via the App Store, as login issues can stem from app bugs.

If you've already done these or the problem persists, sometimes the issue can be server-side or with account configuration. In that case:

- Try logging in via the MapXplorer web portal on a desktop to check if the issue is app-specific.
- If you receive any error messages like "email invalid" or similar, it might help to reset your account password or contact MapXplorer support for account verification.

Would you please try the above steps and let me know what happens? If you want, I can walk you through the password reset or code request process on your iPhone specifically.