Suspicious Login Issues

How to Stop Sign-In Attempts Using an Old Microsoft Account Alias

WPS Content Manager Oct 9, 2026 868 views

Question details

The user wants to stop unauthorized individuals from attempting to sign in using an old Microsoft account alias.

How to Stop Sign-In Attempts Using an Old Microsoft Account Alias

Product: Microsoft Account
Device & OS: not provided
Scenario: The user has disabled an old alias for sign-in but continues to notice unsuccessful authentication attempts in their account activity.
Observed behavior: Disabling the alias prevents successful login, but attackers can still attempt to authenticate using the old address, generating activity logs.

Before you start

Ensure you are logged into your Microsoft account using your primary email alias and have your two-step verification device or alternate email accessible.

Solution 1Recommended

Secure Your Account Against Alias Login Attempts

Since you cannot physically block someone from typing your old alias on a login page, the best solution is to secure the account by invalidating old credentials and enabling strong authentication.

Disabling an alias for sign-in prevents successful authentication through that alias, but it does not stop people from attempting to use the address. To ensure your account remains impenetrable, you must rely on strict security protocols.

Change Your Account Password

Log in to your Microsoft account, navigate to the Security section, and select 'Password security' to change your password. This action will invalidate any saved credentials on other devices.

Enable Two-Step Verification

In the Security dashboard, click on 'Advanced security options'. Find the Two-step verification section and follow the prompts to set it up using an authenticator app or phone number.

Review Recent Sign-In Activity

Go to the 'Sign-in activity' page from the Security dashboard. Verify that the recent attempts using the old alias are marked as 'Unsuccessful sign-in', confirming that your account has not been compromised.

Secure Your Account Against Alias Login Attempts

Alias Attempts Cannot Be Blocked: It is normal to still see sign-in attempts on a disabled alias. As long as the alias is disabled for login and your security settings are updated, these attempts are harmless.

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Frequently Asked Questions

Why do I still see login attempts after disabling sign-in for my alias?

Disabling sign-in privileges for an alias only prevents the authentication from succeeding. It does not stop automated scripts or malicious users from typing your email address into the login field and attempting to guess the password.

Should I delete my old Microsoft alias entirely to stop the attempts?

You can remove the alias completely from your Microsoft account, which will stop the attempts. However, if the alias is a Microsoft domain address (like Outlook or Hotmail), deleting it will permanently close that email address, meaning you will no longer receive any emails sent to it.

Are my files safe if attackers keep trying to log in?

Yes, your files and account data are completely safe as long as the login attempts are unsuccessful. Ensure you have a strong, unique password and two-step verification enabled to maintain maximum security against brute-force attacks.

Microsoft Office Security Issues