Microsoft Account Errors

Fix "This Email Address is Already Taken" Microsoft Account Alias Error

Chanuka Geekiyanage Sep 29, 2026 869 views

Question details

The user is unable to add an existing email address as an alias to their Microsoft account because the system returns a "This email address is already taken" error message.

How to Fix "This Email Address is Already Taken" When Adding a Microsoft Account Alias

Product: Microsoft Account
Device & OS: not provided
Scenario: Attempting to link an existing email address as a secondary alias to a Microsoft account for sign-in or communication purposes.
Observed behavior: The system rejects the email address, stating it is already taken, thereby preventing the user from completing the alias addition process.

Before you start

Verify the domain of the email address you are trying to add, and ensure you have the login credentials for it in case you need to disconnect it from another Microsoft service.

Solution 1Recommended

Create a New Alias for Microsoft Domains

If you are trying to add an Outlook, Hotmail, Live, or MSN address, Microsoft does not allow existing accounts from these domains to be linked as aliases.

Microsoft's alias policies strictly dictate that any existing email address ending in @outlook.com, @hotmail.com, @live.com, or @msn.com is already a standalone Microsoft account. These cannot be merged or added as an alias to another existing account.

Identify the email domain

Check the ending of the email address you are trying to add. If it uses a Microsoft domain (like @outlook.com or @hotmail.com), you cannot use it as an alias for another account.

Create a new email address

On the 'Add an alias' page in your Microsoft account, select 'Create a new email address and add it as an alias' instead of trying to add the existing one.

Register the new alias

Type a new, unique username, select your preferred Microsoft domain from the dropdown menu, and click 'Add alias' to successfully link it.

Create a New Alias for Microsoft Domains

Policy Limitation: There is no workaround to merge two existing Microsoft domain accounts. You must either create a new alias or maintain them as separate logins.

Solution 2

Unlink a Third-Party Email from Its Current Microsoft Account

If the email is from a third-party provider (like Gmail or Yahoo) and shows as taken, it is currently registered to another Microsoft account and must be removed first.

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Frequently Asked Questions

Can I merge two existing Microsoft accounts?

No, Microsoft does not allow users to merge two separate existing Microsoft accounts. You can only add new aliases to an account or transfer a third-party email alias from one account to another.

Why does my Gmail address say it is already taken for a Microsoft alias?

If a Gmail, Yahoo, or other third-party email is flagged as taken, it means it was previously used to register a Microsoft service (such as Skype, Xbox Live, or a Windows PC login). You must log into that specific Microsoft account and remove the email before you can use it as an alias elsewhere.

Can I use a work or school email address as a personal Microsoft account alias?

No. Microsoft generally prevents users from adding work or school email addresses (those associated with Microsoft 365 Enterprise or Education environments) as aliases to personal Microsoft accounts.

If I remove an Outlook.com alias, can I add it to a different account?

No. If you permanently remove an alias that uses a Microsoft domain (like @outlook.com or @hotmail.com), that email address is permanently deleted from Microsoft's servers and cannot be recovered or added to any other account.

Login & Account Issues