Hi! I understand you're not receiving the SMS verification codes for logging into your MyHeritage account. Let's get this sorted out together.

First, to clarify:
Are you trying to log in on your Mac with OS X 10.15, and when prompted for the code, you don’t get the SMS at all? Also, do you still have access to the phone number linked to your MyHeritage account? If you changed your phone number recently, that can affect receiving codes.

Meanwhile, here’s a step-by-step approach we can try to fix this:

1. Log out completely: Make sure you are fully logged out of MyHeritage on your Mac and any other devices.

2. Check your phone number: Confirm that the phone number registered with MyHeritage is correct and active. If you no longer have access to that number, that could be why SMS verification codes aren’t coming through.

3. Network and message settings: On your phone, ensure that:
- You have network coverage and can receive SMS messages.
- You don’t have any call or SMS blocking apps enabled that might filter the MyHeritage messages.
- "Do Not Disturb" mode is off.

4. Use account recovery: Go to MyHeritage's account recovery page at MyHeritage Help Center while logged out. If your phone number is linked, MyHeritage will send you a verification code via SMS to help verify your identity there.

5. Alternative 2FA options: If you had set up an authenticator app or email-based codes, consider using those methods where possible as backups.

If after these steps you still don’t receive SMS codes, please let me know. We can explore further troubleshooting, like verifying with your mobile carrier or escalating this to our technical team.

How does this sound so far? Did you already try any of these steps?