Using classic Outlook for Windows in business environments
Hello Ames84
Welcome to the Microsoft Community.
I understand that you keep receiving unknown one-time code requests from your account.
Hackers may know your account name and they are trying to sign in to your account. Please check your account activity.
https://account.live.com/activity
If you see a lot of hacking attempts in your account sign-in history, you can temporarily hide your Microsoft account sign-in for 3-5 days, hide for a while, and then turn it back on to stop the frequent sign-in failure activity.
- Sign in to your Microsoft account.
- Select Your info, and on the Account information tab, select Edit account info.
- Select Add email.
- You can create a new email address and add it as an alias.
- Then, on the previous page**, select Change sign-in preferences**. After you change the original nickname to a new primary nickname, you can uncheck the original nickname as a sign-in option.
When you revoke an alias as a sign-in option, if someone tries to sign in with the alias, the message "This username has been disabled to sign in" is displayed. Therefore, they can't try to sign in with this alias.
More importantly, this will only affect the login and will not affect email reception. This process is reversible. After a while, you can choose to reinstate your nickname. Perhaps the hacker will lose interest in your account after realizing that they can't access it for a while.
Reminder: Do not delete an alias unless you no longer need it. Similar to closing an account, a deleted Microsoft domain alias cannot be recovered and cannot be used to send or receive email. If you want to stop receiving spam emails to this address by deleting the alias, it is recommended that you unbind it from other platforms before deleting it to prevent inconvenience to your accounts on other platforms.
Reference information: Add or remove an email alias in Outlook.com - Microsoft Support
Feel free to share the results. I look forward to your reply.
Best Regards,
Forry.F - MSFT | Microsoft Community Support Specialist