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:
https://support.microsoft.com/en-us/office/how-to-remove-office-license-files-on-a-mac-b032c0f6-a431-4dad-83a9-6b727c03b193?ui=en-us&rs=en-us&ad=us
If the issue is still existed, you can try to troubleshoot Office for Mac issues by completely uninstalling before you reinstall:
https://support.microsoft.com/en-us/office/troubleshoot-office-for-mac-issues-by-completely-uninstalling-before-you-reinstall-ec3aa66e-6a76-451f-9d35-cba2e14e94c0
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