How to Set up Microsoft Office with Product Key at office.com/setup
Steps to setup Microsoft Office at microsoft365.com/setup are:
Visit www.office.com/setup and follow the on-screen instructions activation link.
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Sign in to your Microsoft account or to manage your Microsoft products’ subscription, create one.
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Enter your product key or code and click Next.
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When your account successfully associated with the key, you’ll see the page “My Office account“.
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Now, Select Install and follow the on-screen instructions.