Invite received at an email not linked to a Microsoft account

if they are Microsoft email addresses then they are permanently linked to the Xbox account.

if you add an alias email then remove the Microsoft email address it will delete the Microsoft email account and you will no longer be able to access anything else connected to it, such as Office 365, and you will no longer be able to send or receive emails
on that account

Hello Caitlin,my name is Marvina, I will be happy to help you.

I'm so sorry for what you're going through, to link your children's accounts to your account, you must sign in to your Microsoft account in a web browser.

Once you're signed in, follow these steps:

Go to family.microsoft.com.

Sign in with the Microsoft account you want to use to manage your children's accounts.

Click "Add a Family Member."

Enter your children's account information, including their email address, name, and date of birth.

Click Next".

Read the terms and conditions and click "I accept."

Click "Send" to send an invitation to your children.

Your children will receive an email with a link to accept the invitation. Once they accept the invitation, their accounts will be linked to your account.

If you are receiving an error when creating your children's accounts, there may be a problem with your Internet connection. Make sure your Internet connection is stable and that you have enough bandwidth to create Microsoft accounts.

Source: https://support.microsoft.com/account-billing/4a07b974-8103-16ad-6ea2-46549ca19e03

These are basic solutions to these problems, but they can lead to a solution, remember that this is a public forum where we are players like you who want to help, good luck and happy day.

Sincerely,
Marvina.

Hi,

Erase Email (Microsoft Account) or forgot Email (Microsoft Account) and GT linked ?

Do you use Xbox One or Xbox 360 ?

Letters ? Do you mean that lost emails received and want to recover it ?

Regards!

The family organizer of the family he is currently in, he must know which account is as he receive the email invitation for that family too

I also want the invite. I have this account since att gives out sbcglobal email account. Yet my I haven't received anything.