Microsoft Office 365 Sign In Required. Sign in to www.office.com from a web browser and start using the apps on the web or access other web services associated with your account such as. Office will only fully activate on the current five logins you make from the software.
It looks to be asking for licensing reasons.
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At your first login, you are required to change your password to ensure that only you can access. Repeat the same for other Microsoft Office Applications like Excel, PowerPoint etc. Your subscription has a sign-in limit that determines how many Office installs you can sign in to at the same time.