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The following activation process takes Office 2021 as an example: (The Office authority will be linked to your Microsoft account.) You need to sign in with a Microsoft account.You need to activate Office within 180 days from the time the Windows OS is activated.
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Before activating Office, please check below Office regulations from Microsoft. This article describes how to activate a one-time purchase version of Office Home & Business (ex: Office 2021, 2019, etc.), and you also can refer to the Microsoft’s Activate Office topic. How to activate one-time purchase Office Home & Business (ex: Office 2021, or 2019)
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