Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
There are some on-going problems reported with the Office apps on an Apple Mac device at the moment.
1
Log into your Microsoft account on this link:
https://account.microsoft.com/services/
What version of Microsoft Office do you have, is that a subscription to Microsoft 365 or a standalone version of Office like Office 2019, 2021 or 2024.
2
At the top left of your Mac desktop, click the Apple icon and select 'About this Mac', what version of MacOS is installed on your computer?