This is not my Email

Here is some info on how to do that: https://support.xbox.com/en-US/my-account/microsoft-account/change-email-sign-in-for-microsoft-account

Hello,

Unfortunately this isn't something that Xbox Support can help you with as it's a Microsoft Account issue. The only way to solve an issue like this, is to fill out the Microsoft Account Recovery form. If you are unable to do that and fill out enough information
then there will be no way to return that account to you and you would be forced to start a new one unfortunately.

Please click this link here, once your at that page you want to click "I think someone else is using my Microsoft account"
and click Reset Password. Enter in the e-mail for the account, and then click "I can't use any of these options", follow through with the prompts on the rest of the pages and you'll be asked to fill in a form with as much information
as possible. If your unable to fill this out, your request will continue to be denied, and there's nothing we can do on this forum to move that process along.

You could also try to reach out to the Microsoft Account team via their forums here.

Please dont post personal emails on the forums. These are public and anyone can see them,

If your email is locked out and you cant remember the passward or Secret passward. Then you my friend are out of luck. And seeing how you said you already contacted Xbox support, Im out of ideas for you. Sorry.

My one suggestion and its probbaly going to happen is you need to start over with a brand new account sadly. But this time dont use the same email andp assward for everything. (for example: Facebook, Youtube...) And dont tell ANYBODY your passward. Not
even family members

Hello

You can make the desired changes to your account by following the link that I leave below, there you can find several options related to the changes you want to make:

https://support.xbox.com/en-US/browse/my-account/manage-account

Also in this link:

https://support.xbox.com/en-US/my-account/microsoft-account/change-email-sign-in-for-microsoft-account

I hope our suggestion will help you. Lets us know!

Have you tried the steps
here