Hi @Jeannine Bogart,
Do you know the Microsoft account, or work or school account, that you used to buy or subscribe to Microsoft 365?
You can sign in with the account to activate your Microsoft 365.
I also suggest you refer to this support article to get more information about activating Office:
https://support.microsoft.com/en-us/office/activate-office-5bd38f38-db92-448b-a982-ad170b1e187e
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