Start using your Office Add-in - Microsoft Support
https://support.microsoft.com/en-us/office/start-using-your-office-add-in-82e665c4-6700-4b56-a3f3-ef5441996862
WEBYou can use the new web Office Add-ins in most of the Office 2016, Office 2019, and Microsoft 365 applications. Select a heading below to open it and see the detailed instructions. Start an Office add-in for Word, Excel, PowerPoint, or Project
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