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Encountering the "Product Activation Failed" error in Microsoft Office 2013 can be frustrating. You might see a red banner reading "Product Activation Failed" or "Unlicensed Product" across Word, Excel, or PowerPoint, often accompanied by a prompt to enter a product key.
Before you panic, understand that this error usually does not mean your license is invalid. It often stems from a corrupted activation cache, a server communication issue, or a mismatch between your installed version and the license key. a server communication issue
