Hi, I'm Ric. It sounds like the system is asking for a code from your second email, but nothing is arriving, even though you're sure the address is correct. That’s incredibly stressful, and I’m sorry you’re going through it.
In cases like this, the best step is to fill out Microsoft’s account recovery form here https://account.live.com/acsr
You can also check this page for extra guidance: https://support.microsoft.com/en-us/account-billing/help-with-the-microsoft-account-recovery-form-b19c02d1-a782-dee6-93c3-dc8113b20c42
If the recovery doesn’t work the first time, don’t give up, you can try again with any new info you remember.