Hello,
Did you encounter a direct error message during activation?
Ensure that your device is connected to the internet properly.
Microsoft provides a tool that can help diagnose and fix common activation issues. You can download it from the official Microsoft support page.
Check if you have activated Office on more than one device, try deactivating it on one of them and then attempt to activate it on the current device.
Also you might need to uninstall Office completely and then reinstall it using the installation files from the official Microsoft website.
Best Regards,
Hania Lian
============================================
If the Answer is helpful, please click "Accept Answer" and upvote it.