The is the "answer" code provided by Microsoft after receiving your Installation ID. It is also a string of numbers. Once you enter this ID into the activation wizard, it verifies that your copy of Office is genuine and unlocks the full functionality of the software.

| Format | Use Case | | :--- | :--- | | Raw 48-digit string | Pasting into Office activation dialog | | Grouped (8 blocks of 6) | Telephone entry (default Microsoft format) | | JSON | API responses | | CSV | Batch results export |

Even with the correct IID and CID, things can go wrong. Here are the most common issues.

Navigate to and select Activate Product (or Change Product Key if already signed in).

had just reinstalled a classic version of Microsoft Office on a new computer, but the usual "Activate Online" button yielded a stubborn error.