Microsoft Account you want to use (ensure it's the correct one, as you can't easily move the license later). Enter your 25-character key without hyphens. Follow the prompts to download and install your apps. Microsoft Support "I'm being asked for a key, but I don't have one!" This is a common headache for many users. If you already have an active subscription but Office is still asking for a key, it usually means: You just need to sign in: Look for a "Sign In" link on the activation screen instead of a box for a key. Pre-installed Trials: Your new PC might have a "Trial" version of Office pre-installed that is conflicting with your paid version. It is often best to uninstall the existing Office apps and reinstall them directly from your Microsoft Account dashboard . Summary Tips for Success Keep it safe: Until you’ve redeemed the key, treat it like cash. Check the expiration: Subscription keys usually add 12 months to your current balance—they don't "reset" your clock, they extend it! Need more help? If you get a "Key already used" error, skip the key entry and just sign in at
A product key is a 25-character code used to activate a Microsoft product, including Office 365. It's a unique identifier that verifies the authenticity of the software and ensures that it's not pirated or counterfeit. The product key is usually provided by the retailer or reseller when you purchase Office 365. product key 365 office