You'll see this message along with either error code INVALID_PRODUCT_KEY or error code ERR_INVALID_TOKEN if you enter the wrong product key, or if you have a typo in your product key. Examples of using the wrong product key. Most Microsoft products use a 25-character product key.

If you're looking for product keys for Office, apps, games, and more, see Find your Microsoft downloads and product keys. Learn how to find a Windows product key for activation, and when you'll use a digital license instead.

A BitLocker recovery key is needed when BitLocker can’t automatically unlock an encrypted drive in Windows. This key, which is a 48-digit number, is used to regain access to the drive. You might be prompted for the BitLocker recovery key during startup, due to a security risk or hardware change:

If your purchase of Office or Microsoft 365 came with a product key, you enter your product key on one of the websites listed below for your product. After you enter your key, you can download and install Office, or you can renew your Microsoft 365 subscription. Tip: Get tech expertise with Business Assist.

This article applies to Office Home & Business, Office Professional, and individually purchased Office apps. To switch an Office install to or from Microsoft 365, see Switch your Office license. Change the product key for your version. How you change the product key depends on your version of Office. Select your Office version from the tabs below.

Troubleshoot Game Bar on Windows. If you’re having trouble using Game Bar—like getting keyboard shortcuts to work—here are some things to try. Things to keep in mind: As of October 2024, Windows 10 22H2 or newer is required for some features to work properly within the Xbox app and Game Bar.

Download and create a factory recovery image for your Surface. Before you begin. A recovery drive lets you reset your Surface to its factory settings and can help you troubleshoot and fix problems with your Surface device. Windows comes with a built-in tool to create a USB recovery drive.

To fix problems using Windows Update: Select Start > Settings > System > Recovery > Fix problems using Windows Update. After you select the Reinstall now option, choose if you want to allow the PC to automatically restart 15 minutes after the installation completes.

Fix-it tools aren’t used in Windows 10. Instead, use a troubleshooter to help solve problems with your PC.

A product key is a 25-character code that's used to activate Windows and helps verify that Windows hasn't been used on more PCs than the Microsoft Software License Terms allow. Windows 11 and Windows 10: In most cases, Windows 11 and Windows 10 activates automatically using a digital license and doesn’t require you to enter a product key.