Office repeatedly prompts you to activate on a new PC
 

If you find that Office keeps propmting you to activate it could be that you didn’t uninstall the pre-installed version of Office on your new PC before installing a volume license version of Office.

Microsoft already has a great page explaining how to fix this:

https://support.microsoft.com/en-gb/office/office-repeatedly-prompts-you-to-activate-on-a-new-pc-a9a6b05f-f6ce-4d1f-8d49-eb5007b64ba1?ui=en-us&rs=en-gb&ad=gb