Hi @Indi Tansey ,
Did you check if other Office programs will get the same problem?
I suggest you try to download the license removal tool to help you remove license files on Mac:
If the issue is still existed, you can try to troubleshoot Office for Mac issues by completely uninstalling before you reinstall:
Just checking in to see if the information was helpful. Please let us know if you would like further assistance.
If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.