Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Do you see this issue when launching any other Office applications such as Excel or PowerPoint? If not, then we know we need to troubleshoot Word and its preferences. Otherwise, we need to troubleshoot Office 365.
If you’re unable to activate any part of Office then log in to Office 365 online and ensure you haven’t exceeded your installed computers limit. If you see “ghost” computers (the same computer multiple times) then deactivate all the computers in the website. Return to Office for Mac on your computer and try activating again.
Finally, I suggest that you contact the Office Installation and Activation Support team if you continue experiencing activation issues:
Office Installation and Activation Support
(800) 936-5700
Hope this helps!