Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello !
On Mac, you'll have to uninstall Microsoft Office and then reinstall it from the Microsoft account dashboard.
Use these tutorials from Microsoft support : https://support.microsoft.com/en-us/office/uninstall-office-for-mac-eefa1199-5b58-43af-8a3d-b73dc1a8cae3 and https://support.microsoft.com/en-us/office/troubleshoot-office-for-mac-issues-by-completely-uninstalling-before-you-reinstall-ec3aa66e-6a76-451f-9d35-cba2e14e94c0
Once done, reboot your Mac and go to https://account.microsoft.com/services to download Office and reinstall it.
Please let me know if you have any other question !