how do I find out if my email address is an alias for a microsoft 365 work or school account

[dmwinsurance]

how do I find out if an email address is an alias for a microsoft 365 work or school account ?We'd like to add our daughter to our family office 365 subscription, with the email address that she uses most often. But when she currently uses word or excel on her macbook, she is already logged in to microsoft using that email address. She doesn't know how, and nobody in our house seems to be paying for a microsoft account using that email address. How would we find out if this email address is setup as an 'alias' for an another microsoft account (such as a previous employer, or school). She'd re

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