How to remove office license files on a mac
[REF]:
https://support.microsoft.com/ja-jp/microsoft-365-activation-licensing/how-to-remove-office-license-files-on-a-mac
These instructions may help with troubleshooting activation by removing all Office license files from your Mac. For example, if you previously installed a one-time purchase of Office for Mac and have switched to Microsoft 365, you may not be seeing subscription features because your copy of Office is still using your old license.