Hi! I understand you're having trouble logging into the Universal Orlando Resort app because it says your credentials are invalid. Let’s get this sorted for you.

First, just to clarify: Are you entering your email and password directly into the app? Also, have you recently changed your password or created the account on the Universal Orlando website before trying the app? Any extra details like if you use any password managers would help me guide you better.

Meanwhile, here are some simple steps you can try:

1. Double-check your login details: Make sure there's no typo in your email address or password. Sometimes, something like an accidental space or capitalization can cause this error.

2. Reset your password: If you’re certain your credentials are correct but still can't log in, try resetting your password. You can do this through the Universal Orlando website here: https://res.universalorlandovacations.com/account/requestpasswordresettoken.aspx. Enter your email and follow the instructions in the email you receive.

3. Try logging in via a web browser: Visit the Universal Orlando Resort website and try logging in there with the same credentials. This confirms if the problem is app-specific or account-related.

4. Update or reinstall the app: Make sure the app is updated to the latest version on your device. If it is, try uninstalling and then reinstalling it to clear out any cached data that might be causing issues.

5. Check your internet connection: Since you’re on Windows using a WebKit browser engine, ensure you have a stable internet connection that isn’t blocking any app services.

If after these steps the problem persists, sometimes the app login system might be experiencing temporary glitches, or there might be account-specific restrictions.

Let me know which steps you’ve already tried or if you want me to walk you through any of them in detail! Are you satisfied with the solution I provided so far?