single use code

Question

i never requested a single-use code but was sent one to my email address:

******@gmail.com

Answer 1

Sign into the account here: https://account.microsoft.com, then go to Security to review the sign in activities. When you reviewed the account's sign in activities, Click into those labeled as "unsuccessful sign in", you can click on it to expand it to review the Session activity. If it is incorrect password, it won't generate a code. And there's nothing to worry about. If it is request denied xxx, that means this activity had your password entered correctly, and a code was generated, but it didn't pass the two factor verification. In the latter scenario, you want to change the password asap.

If you can NOT find any unsuccessful sign-in with the "request denied" labeling, it can mean that someone else left your contact information as their security info, usually due to typo. In this case, your account is not in any danger. Unfortunately there's also nothing you can do about it until this other user realized they needed to update their contact info.

Another way to find out which scenario is yours is to go to the account https://account.microsoft.com click on Security > Advanced Security options, set up authentication app instead. That way, if you continue to receive code via text or email instead, you would know 100% that it is NOT about your account, but someone else left your phone/email as their contact info due to typo.

Answer 2

A single-use Microsoft verification code that was not requested usually means one of the following:

1. Someone is trying to sign in to the account and entered the email address.
2. Someone mistyped their own email and accidentally used this address.
3. A previously requested code was delayed and arrived later than expected.

Do not use or reply to any verification code that was not requested. Without the code, an attacker cannot complete sign-in, so the account remains protected.

To improve security and reduce unwanted codes, enable passwordless sign-in methods such as Microsoft Authenticator, Windows Hello, SMS/Email codes, or a physical security key. Going passwordless makes it harder for attackers to access the account using only a password.

If unrecognized codes continue to arrive, review and secure the Microsoft account and consider going passwordless using the documented steps.

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References:

• Troubleshoot Microsoft verification code issues
• Common problems with two-step verification for a work or school account

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