Duplicate logins

Question

I have one Microsoft Account. It includes one Cloud account and one MS 365 subscription. But, I have two different logins and two different passwords, and both work to access the same Microsoft Account described above.

My online reading says this is not possible (MS does not allow it) but the fact remains I have two logins and two passwords, and I can use both/either to access the same MS Account.

How can this be? Can someone guide me through a process to fix this?

Answer 1

Hi, Matthew Welter

This can happen even if there is only one Microsoft account, because the “second password” may not actually be a normal account password. It could be a saved browser/password-manager entry, an app password for older apps, or a passwordless/passkey/Windows Hello sign-in being mistaken for a second password.

Besides the solutions provided by the Q&A Assist, here are some suggestions you can try:

First, test it in a clean way. Open a private/InPrivate browser window, go to the Microsoft account sign-in page, and manually type each login and password. Do not use autofill. If only one works, the issue is probably a saved password in the browser or password manager.

If both still work, go to Security > Advanced security options in the Microsoft account. Check whether app passwords, passkeys, Authenticator, Windows Hello, or other sign-in methods are listed. It is recommended that you remove anything you do not recognize, especially old app passwords or old devices.

Then change the Microsoft account password once from the official account security page. After that, sign out of all devices if the option is offered, then sign back in only with the new password.

Also check the Recent activity page. If you see “app password created,” “app password deleted,” unfamiliar devices, or unknown locations, treat it as a security issue and remove those methods immediately.

If two different typed passwords still work after all that, I would contact Microsoft support, because normal web sign-in should not keep two regular passwords active at the same time.

Please be advised that this is a user-to-user support forum. Moderators and contributors, including external Microsoft employees, are not allowed to directly interfere with Microsoft product features or access back-end systems. Our role is limited solely to providing technical guidance on reported incidents, requests, or ideas.   

Thank you for your patience in reading, I hope this information has been helpful to you. 

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Answer 2

I repeat: I never said I had two accounts, I do not. I'm sure I only have one account, but two separate user names and passwords.

Answer 3

I never said I had two accounts, I do not. I have one account, but two separate user names and passwords.

Answer 4

This situation is almost certainly caused by Microsoft account aliases, not two completely separate accounts.

Key points from the account system:

1. Email addresses and phone numbers on a Microsoft account are called aliases.
   • All aliases share the same underlying Microsoft account, including the same subscriptions, OneDrive, Outlook, etc.
   • Aliases share a single password at any given time, but it is possible that one alias was used with an older password and another with a newer one if passwords were changed at different times or cached on devices.
2. It can look like “two accounts” because:
   • Different email addresses or phone numbers (aliases) can be used to sign in.
   • A work/school account and a personal Microsoft account can use the same email address, which then shows the “Which account do you want to use?” prompt. In that case, there really are two identities (work/school vs personal) that may access overlapping services.
3. Microsoft explicitly supports multiple aliases on one account and allows choosing which aliases can be used to sign in. This can create the impression of duplicate logins.

To verify and fix/clean this up:

1. Go to the Microsoft account security and alias settings:
   • Sign in to the Security tab at https://account.microsoft.com/security.
   • Select Manage how I sign in (or Manage how you sign in / Sign in preference depending on the page wording).
2. Review aliases:
   • Check the list of email addresses and phone numbers associated with the account. These are the aliases currently tied to the same Microsoft account and services.
   • Confirm that both “logins” being used appear here.
3. Choose a primary alias and sign-in options:
   • Select the preferred email/phone as the primary alias (this is what appears on devices and in many places).
   • If one alias should no longer be used for sign-in, change sign-in preferences so that alias is blocked for sign-in while still kept for email if desired.
4. If there is also a work or school account with the same email address:
   • The “Which account do you want to use?” prompt indicates a work or school account and a personal account share the same email.
   • To stop that prompt, either rename the personal Microsoft account (change its primary alias) or contact the organization that created the work/school account to remove or change it.

This will leave a single, clear sign-in identity for the Microsoft 365 subscription and cloud account while still allowing multiple contact addresses if needed.

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References:

• Which account do you want to use?
• How to use two-step verification with your Microsoft account
• About accounts in Office
• Help with "phone number is already used" in a Microsoft account
• How to fix "This username has been turned off" error