*** Product Key Activation Link Microsoft Office 365 ( Office.com/setup or Microsoft365.com/)

 To activate Microsoft 365 with a product key, you can go to Office.com/setup or Microsoft365.com/setup and follow the on-screen prompts. You can also activate Microsoft 365 in the Microsoft 365 admin center.
Microsoft 365 admin center

    Sign in to the Microsoft 365 admin center
    Select Billing > Your products
    Select the Volume licensing tab
    Go to the Product & Services or Contracts modules
    Select the license ID to manage under the Keys section
    Select the Manage activation link, then select Start Activation
    Continue the remaining activation steps

Office.com/setup or Microsoft365.com/setup

    Go to Office.com/setup or Microsoft365.com/setup
    Follow the on-screen prompts