How to sign into an Xbox account that shares an email with another

I would keep your email as the primary in that case. Your son will be able to sign in using his email. If you are both using the same console, I would sign in with your account and set the console as your Home Console, that way you can share Xbox Live
Gold, Games and Game Pass subscription with your son. More details can be found here on how to share with another account

https://beta.support.xbox.com/help/hardware-network/console/my-home-xbox

Are you 1000% sure you actually used the email assosciated with your gamertag? You wouldn't have been able to setup a new gamertag if you'd been in the proper sign in area. Check the instructions here for how to sign in on a new console, or recover your
account if you've forgotten your details.

https://beta.support.xbox.com/help/family-online-safety/shared-consoles/sign-in-to-another-console

I take it this is a Microsoft email such as outlook or Hotmail. This is a problem, that email is the account name so we cannot change that and we cannot move that content to another account. You used to actually be able to move this to another email
using the Xbox 360 but they stopped this several years ago. As the previous poster suggested the home xbox option will allow you to share this to another account.

Hi there,

you can't really moved an Xbox Live Account to another Microsoft Account.

The only thing you can do is change the primary email address used to sign in to a Microsoft Account.

If that is also an option for you then please see this link for information on how to change the email address itself:

https://beta.support.xbox.com/help/Account-Profile/manage-account/change-email-sign-in-for-microsoft-account

Let us know the results

Hello there,

If I remember correctly it is quite tricky but it should work.

Log-in to that Microsoft account where you want to change your email.

Add another mail address (microsoft account) as a way to sign-in.

Make that mail primary.

Remove your old email.

This guide should help and provide more information about this topic.

Let me know if it helps.

I'm not sure about the games and purchases, but if you share everything using your Xbox Home that will be fine.