You purchased a new PC that came with Office pre-installed and have completed going through the activation process from a "Let's get started" page. Then, when you try to start an Office application, you'll instead be returned repeatedly to a "Let's get started" page. Follow these steps to get around this issue.
Install Office from the Services & subscriptions page
Important: Before you begin, be sure you have your email address and password handy. You'll need to sign in with the Microsoft account that you used to set up Office.
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Exit all your Office applications.
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Go to Services & subscriptions.
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Locate your Office product and select Install.
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Select your install options, and then select Install.
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Proceed with the Office installation as instructed. For more details about the installation process, see Install Office on your PC or Mac.