Microsoft Account Errors

Fix Cannot Add Existing Email as Alias in Microsoft Account

Kushani Nimanthika Oct 12, 2026 869 views

Question details

The user is unable to add an existing email address as an alias to their Microsoft account.

How to Fix "Cannot Add Existing Email as Alias" in Microsoft Account

Product: Microsoft Account
Device & OS: not provided
Scenario: Attempting to link an additional email address to an existing Microsoft account for login or communication purposes.
Observed behavior: The system displays an "Email address already exists" error when trying to add an existing Outlook.com, Hotmail, Live, or MSN address as an alias.

Before you start

Verify whether the email address you are trying to add is an existing Microsoft domain (Outlook, Hotmail, Live, MSN) or if it is already associated with another Microsoft account.

Solution 1Recommended

Use a Third-Party Email or Create a New Outlook Alias

Since existing Microsoft domain emails cannot be added as aliases to another account, you must either create a brand new alias or link a non-Microsoft email address.

Microsoft's security policy restricts adding an existing Outlook.com, Hotmail, Live, or MSN email address as an alias to another Microsoft account. To resolve this error, you will need to generate a new Outlook.com email address directly from the alias settings or use an email address from a different provider, such as Gmail or Yahoo.

Access Microsoft account management

Navigate to Your info

Click on the "Your info" tab at the top of the page, then select "Edit account info" under the Account info section.

Add an email

Click on "Add email" under the Account alias section.

Select a valid alias option

Choose "Create a new email address and add it as an alias" to make a new Outlook.com address, or choose "Add an existing email address as a Microsoft account alias" and enter a third-party email address (like Gmail).

Save changes

Click "Add alias" to apply the changes to your account.

Use a Third-Party Email or Create a New Outlook Alias

Third-Party Email Limitation: You can only add a third-party email address if it is not already registered as a primary or secondary email for another Microsoft account.

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Frequently Asked Questions

Can I merge two existing Microsoft accounts?

No, Microsoft does not allow merging existing accounts or moving an existing Microsoft domain email (like Hotmail or Outlook) to be an alias of another account.

Why do I get the 'Email already exists' error with my Gmail address?

If your third-party email (e.g., Gmail or Yahoo) is already registered as a primary or recovery email for a different Microsoft account, you cannot add it as an alias until it is removed from that other account.

How many aliases can I have on my Microsoft account?

Microsoft allows you to have up to 10 aliases connected to your account at any given time, and you can add a maximum of 10 new aliases per year.

Login & Account Issues