Move Game Tag from my email @outlook.com to my son email @outlook.com

Their email is an @outlook.com email.

I have a feeling that I know the answer to this but I am taking a shot in the dark here.

I have an Xbox Live Account that is associated to a Gmail email address. I recently purchased a family subscription to O365 for a year and got a new Outlook.com email address. My original Gmail address account has a ton of purchased games and saved game
data on it that I want to move to the new Outlook.com account. I know you cannot move the games or data, but I would think that I would be able to associate the existing account with the new Outlook.com account, but it seems the new account already has an
Xbox Live account and auto-generated Gamer Tag associated with it so when I try to add the Outlook.com alias to the Gmail Xbox account I get an already exists error.

Are there any options here to accomplish my goal? I want to get rid of the Gmail account altogether and just use the Outlook account for everything without having to purchase my games again and lose my saved game data. Can the Xbox profile associated with
my Outlook.com account be deleted so I can add the alias.

I get the Microsoft doesn't want people selling gamer tags and saved game data, but they should also assist people when they are trying to use their products and purchase their subscriptions.

Any help is appreciated. Thanks.

You should be able to change the email address associated with your gamertag. You can do that here:

https://account.microsoft.com/profile/

Click the "Manage how you sign into microsoft" and in there you should be able to change the primary email address associated with your accounts. Set your new email address as the primary. Then to double check you can remove the profile from your console
(not the games or save data) and just re-download the profile and make sure you use the new email address to make sure it correctly recognizes it.

So if you migrate your email to outlook.com, your Xbox account doesn't automatically change?

I thought all Microsoft services would change to the new outlook.com email?

You don't you can only change external emails alias

Your ms account and outlook.com emails are one and the same and this includes hotmail as it is under the outlook.com services umbrella

No, you cannot move ownership of an XBL account to a different email. You also don't need the outlook app to use an outlook email. You can just use outlook.com.