Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
I'm not sure what version you are running but I have Office 365 which has the "File > Office Account". It should be located at the top left of your screen when you start Outlook. If not, the opening screen has been changed...not sure how that would have happened. When you click on "File", the "Office Account" will be in the left menu bar, near the bottom of the screen.
I don't have the MAC version.