Block an email address from signing in
Email addresses and phone numbers associated with your Microsoft account are called aliases, and they use the same contacts, online storage, subscriptions, and account settings. Your aliases share a single password.
By default, all of your aliases can be used to sign in, but you can block sign-in for certain aliases. To restrict sign-in for certain aliases:
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Sign in to your Microsoft personal account at account.microsoft.com and select Your info, then Sign-in preferences.Sign in
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Choose which aliases are allowed to sign in to your account and select Save.
See also
How to fix "This username has been turned off" error
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