Some may encounter issues with Office activation failure. The specific issue is that even though the computer is connected to the internet and the system is activated, when you open Office, it prompts for a trial, purchase, or to enter a product key.
See the screenshot below:
To address this, Microsoft has built an official tool that clears the activation information, allowing for re-activation. Download link: http://aka.ms/diag_97275
If your browser warns with messages like “The file may be harmful” or “Cannot download safely” during the download process, you can proceed with confidence. This is an official Microsoft program and is completely safe.
After downloading, double-click to run the tool and follow the prompts to complete the repair. Once the process is finished, restart your computer, open Office, and log in to your Microsoft account to activate as prompted.