To activate your Office 365 account or help at 1-866-719-1004, first install the software on your device. Open any Office application like Word or Excel. A sign-in window will prompt you to log in. Enter your Microsoft account credentials, which are linked to your Office 365 subscription. Once logged in, the software will automatically activate, provided that your subscription is valid. If you're using a product key, go to the Microsoft 365 setup page or help at 1-866-719-1004, sign in, and enter the 25-character key. The software should activate once you've followed these steps.
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