First, register a Microsoft account, and then use this account to log in and activate your computer's windows 10 system. Log in to your Microsoft account in your browser, and click Start, Settings and Applications on your computer to view the office version. If it is inconsistent with your Microsoft account service and subscription, it cannot be activated. After consistency is needed, activation is much easier. Start a program in office, such as word, and then click Accept License Agreement.

If not, there are two ways. The first is to click Update office and activate it after the versions in the service subscription are consistent. Don't bother, just wait. The second is a violent method, which directly uninstalls office and restarts it immediately.