My Xbox Live Gamertag is linked to a microsoft account that no longer exists.

You'll need to follow the steps at the link below to change the Microsoft Account associated with the gamertag.

support.xbox.com/.../microsoft-account-faq

Good luck.

Hello SantiagoBarbosa,

Thank you for reaching out to us about your issue!

If you still have access to your Xbox 360, you can try powering it on and seeing if your account is still signed in. If it is:

Navigate to your Settings and then select Account.

Once in Account, scroll right to Your Information and then Account Security.

You should see the Microsoft Account which will display the email that you are looking for.

Below I've provided a link to a guide from Microsoft support that will walk you through what you should do when you forget your Microsoft account username or associated email address. Try reading through the documentation and following the steps.

Link: You forgot your Microsoft account username

Since you have tried signing into an account but cannot remember the password, I would first try resetting your password. If that doesn't work, you can also try filling out the account recovery form located here: Recover your account (live.com)

[Let us know if this answered your question by tapping "Yes" below]

Thank you for contact us! I'm Anderson, an Independent Consultant and a Microsoft user like you.

good evening

Your Xbox gamertag is linked to your Microsoft account, but if it was created with an old email address that no longer exists, you will need to create a new Microsoft account with your current email address and link it to your Xbox gamertag.

To do this, follow these steps:

Go to the Xbox website and sign in with your current email address.

Create a new Xbox gamertag if necessary.

Link your new gamertag to your Microsoft account.

Transfer your Xbox Live Gamerscore and Xbox One games to your new gamertag.

support.xbox.com/.../manage-microsoft-account

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Why do I get a “The Microsoft account (or Windows Live ID) you’re switching to is already linked to another Xbox account” error message?

If you try to switch your Xbox LIVE gamertag to a Microsoft account that is already linked to another gamertag, you will receive a message that says “The Microsoft account (or Windows Live ID) you’re switching to is already linked to another Xbox account.”

Before you can switch your gamertag in this case, you must first remove the existing gamertag from that Microsoft account:

1.Create a new Microsoft account. You will only need this new account as a temporary means of moving your gamertags. After the gamertags have been switched, you will no longer need this Microsoft account.

Example:

Gamertag A is linked to Microsoft account 1.

Gamertag B is linked to Microsoft account 2.

To swap gamertags A and B between Microsoft accounts 1 and 2, first create a third temporary account: Microsoft account 3

2.Switch the gamertag that is linked to the Microsoft account you want to use to the new temporary account you just created.

Example:

Gamertag A remains linked to Microsoft account 1.

Switch gamertag B to Microsoft account 3.

Microsoft account 2 is now free.

3.Now switch your gamertag to the Microsoft account you want to use.

Example:

Switch gamertag A to Microsoft account 2.

Gamertag B remains linked to Microsoft account 3.

Microsoft account 1 is now free.

4.To complete the swap of gamertags between the two original Microsoft accounts, you must wait 30 days. (A gamertag can be switched only once every 30 days.)

Example:

Gamertag A remains linked to Microsoft account 2.

After 30 days, switch gamertag B to Microsoft account 1.

Microsoft account 3 is now free and no longer needed.

Switch gamertags between two Microsoft accounts

If you try to switch your Xbox LIVE gamertag to a Microsoft account that is already linked to another gamertag, you will receive a message that says “the Microsoft account (or Windows Live ID) you’re switching to is already linked to another Xbox account.”

Before you can switch your gamertag in this case, you must first remove the existing gamertag from that Microsoft account:

1.Create a new Microsoft account. You will only need this new account as a temporary means of moving your gamertags. After the gamertags have been switched, you will no longer need this Microsoft account.

Example:

Gamertag A is linked to Microsoft account 1.

Gamertag B is linked to Microsoft account 2.

To swap gamertags A and B between Microsoft accounts 1 and 2, first create a third temporary account: Microsoft account 3.

2.Switch the gamertag that is linked to the Microsoft account you want to use to the new temporary account you have just created.

Example:

Gamertag A remains linked to Microsoft account 1.

Switch gamertag B to Microsoft account 3.

Microsoft account 2 is now free.

3.Now switch your gamertag to the Microsoft account you want to use.

Example:

Switch gamertag A to Microsoft account 2.

Gamertag B remains linked to Microsoft account 3.

Microsoft account 1 is now free.

4.To complete the swap of gamertags between the two original Microsoft accounts, you must wait 30 days. (A gamertag can be switched only once every 30 days.)

Example:

Gamertag A remains linked to Microsoft account 2.

After 30 days, switch gamertag B to Microsoft account 1.

Microsoft account 3 is now free and no longer needed.

support.xbox.com/.../manage-microsoft-account

Hope this helps!