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If you're not already in an Office file or document, open an app such as Word or Excel, and open an existing file, or create a new one.
Select File > Account (or Office Account if you're using Outlook). If you're not already signed in, click Sign In.
In the Sign in window, type the email address and password you use with Office. This might be the personal Microsoft account you associated with Office, or the username and password you use with your work or school account.
This way you can successfully login to you Outlook 365 account.