For legacy @xboxlivefamily.com accounts, the primary alias can be restricted and show “Your organization’s policies prevent you from changing your primary username.” In that case, changing or removing that primary alias is often not available in self-service.
What is supported:
- Try adding a usable alias if it is not already present:
- Sign in to Manage how you sign in to Microsoft.
- Select Add email.
- Add an existing email address or create a new Outlook.com address.
- Verify the new alias.
- If the option is available, try to make that alias primary:
- On Manage how you sign in to Microsoft, select Make primary next to the usable email address.
- If Make primary is unavailable or the Xbox Live Family alias remains locked/greyed out, that matches the documented limitation for some legacy Xbox Live Family accounts.
- In that situation, the practical workaround is:
- Keep the legacy alias attached.
- Use the added email alias to sign in, if sign-in is allowed for that alias.
- Check Your info > Sign-in preferences and ensure the usable alias is allowed for sign-in.
- Important removal warning:
- If an alias uses a Microsoft domain such as @hotmail.com, @live.com, @outlook.com, or @msn.com, removing it permanently deletes that alias and it cannot be associated with a Microsoft account again.
- A non-Microsoft-domain email alias usually becomes available to add to another Microsoft account after removal.
For this specific @xboxlivefamily.com scenario, the available context indicates these legacy accounts can remain restricted from changing the primary alias. If the account already has another alias, the supported path is to use that alias for sign-in and communications where possible; full removal or replacement of the legacy primary alias may not be available through account settings.
- Add or remove an email alias in Outlook.com
- How to add an email address or phone number to your Microsoft account
- Change the email address or phone number for your Microsoft account
- Block an email address from signing in
- Need help changing my alias (@xboxlivefamily.com account alias) - Microsoft Q&A
- How to change primary username (xboxlivefamily.com) to gmail? - Microsoft Q&A