If you received the message "This phone number has already been taken” when adding a phone number to an account, it means the phone number is already associated with another Microsoft account.
You can transfer the phone number if you own both accounts.
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Sign in to the account that has the phone number you want to move.
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Select Remove next to the phone number to be transferred.
Note: You can only remove the phone number if you have another username on the account. We recommend having at least two additional forms of contact on your account.
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Sign out.
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Sign in to the account that you want to add the phone number to.
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Select Add phone number to include the number to the account.
