Dear Sonia Pritchard
Thank you for your reply.
Obviously, the hackers are using specialised cracking tools to try and crack your password without stopping, but even if they do, they can't directly access your account
We're glad to talk to you more about the security of your Microsoft account.
First of all, two-step verification protects your Microsoft account, and your two-step verification protection will automatically kick in if you sign in to your account from an unknown device or an unusual IP address.
The problem is that, for convenience, if you sign in to your Microsoft account from a commonly used device, such as signing in to your Microsoft account using EDGE, a short-term SESSION ID file will be generated that is designed to automatically re-sign in in case you suddenly and unexpectedly close your browser. Acredential files are also generated in Windows to allow you to quickly log in to your Microsoft account, which I think may be your problem.
The good news is that you don't have to worry about this scenario, if the hacker just got your password then the login will definitely be blocked by the two-step authentication as it doesn't have your login credentials nor your session ID file.
Honestly, many users nowadays are experiencing account hacking mainly due to logging into Microsoft accounts in public environments such as internet cafes, libraries, and cafe computers.
If these devices come pre-installed with a Trojan Horse programme, then the hacker may be able to simulate the login environment by stealing the SESSION ID file and then change your password. However, if the hacker tries to change your two-step verification information, the account will be frozen for a month, at which point you can change your password on a secure computer to prevent the hacker from stealing your account.
The second scenario is when you accidentally click on a phishing email and enter the correct account name and password. The same hacker may be able to access your account, but it will freeze your account when the authentication information is changed and you will receive a warning email alerting you that important rescue information is being changed.
So, in conclusion, as long as the user is security conscious and adds additional authentication methods such as Rescue Mobile, Rescue Email and Microsoft Authenticator tools, all of these can ensure that your account is secure.
Of course, you can re-add an alias for your account and set it as the primary alias, and then remove the login access to your current address, (it is not recommended that you delete it directly, Microsoft domain deletion will not be recoverable), this method will be effective in curbing uninterrupted logins from hackers.
Add or remove an email alias in Outlook.com - Microsoft Support
I hope the above information can help you.
Best Regards,
Peter.Y-MSFT | Microsoft Community Support Specialist