Change Alias
access to here use your account
Click Add email
Microsoft gives you two options: the first is to set up a new alias name. The second is to link your email as an alias too (assuming that email isn't registered with a Microsoft account or is an alias for another account).
Then Add username
Click Make primary on the alias you just created And delete the old alias If you want you can enter your phone number as alias and from now on when you log in to your account you only need to enter your phone number or your new account addrs. old don't work anymore
At this point, the account has been almost completely changed. There are some additional steps to prevent your account from being stolen. Like binding Authenticator
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