: Once the key is verified, click Install from your Services & Subscriptions page.
This error means the key is already tied to a Microsoft account. You do not need to buy a new one.
To , you must link your 25-character product key to a Microsoft account through the official setup portal or sign in to a pre-installed version on a new device. Office 2021 is a one-time purchase, meaning once it is linked to your account, you can reinstall and reactivate it without needing to enter the key again. Method 1: Direct Activation with a Product Key activate office 2021
✅ Once activated, you’ll see under File → Account .
When you first open any Office app (Word, Excel, PowerPoint): : Once the key is verified, click Install
This usually indicates permission issues. Running the Office app as an administrator often fixes this.
– Office 2021 (perpetual license) requires a unique key. If you don’t have one, you can: To , you must link your 25-character product
Even with a valid key, things can sometimes go wrong.