Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello !
With your Mac, can you try to go to https://account.microsoft.com/services and see if you can see your Office install ? It should be at the bottom of the page, under "Products you've purchased."
After you've checked that Office is correctly linked to your Microsoft account, launch any Office app, and make sure you're signed into your Microsoft account : you can do so by clicking on the "Sign in" icon in the top-left corner of any Office app. Once signed in, the license should be applied to your Office installation. (if you see a pop-up asking you to log into Microsoft 365, close it. You need to reach the "sign-in" button in the top-left corner of any Office app)
Looking forward to your answer !