Hi! Sorry to hear you’re having trouble signing in to your MyHeritage account even though you’re sure the email and password are correct. I want to help you get this sorted quickly.

Just to clarify first:
- Are you trying to log in via the MyHeritage website on your Mac or the app?
- Have you recently changed your password or email linked to your account?
- Are you seeing any error messages when you attempt to sign in?

Meanwhile, here are some common fixes we can try together:

1. Reset Your Password
Sometimes, even if you think the password is correct, there might be a mismatch or expired password issue. Since you’re on macOS 10.15.7, open your browser and go to the MyHeritage login page: click on the "Forgot password?" link just beneath the Log In button. Follow the steps to reset your password. This usually resolves most sign-in issues1.

2. Clear Browser Cache or Try Another Browser
Occasionally, cached data can cause login problems. On your Mac, try clearing your browser cache or switching to a different browser like Safari, Chrome, or Firefox to see if that helps.

3. Check for Two-Factor Authentication (2FA)
If you have 2FA enabled, ensure you complete that step properly. Sometimes, users get stuck on verification codes. If you’re not receiving codes or it’s causing trouble, let me know, and I can guide you through options4.

4. Verify Your Account Status
There could be flags on your account causing sign-in blocks (for example, suspicious activity). If password reset doesn’t work and you still can’t log in, I can help you verify your account status or escalate the issue.

Could you please try the password reset first and let me know what happens? Also, if there’s a specific error message, sharing that would help me pinpoint the issue better.