For specifics of how you can assign licenses, see Assign licenses to consumers in Microsoft 365 for organization. Idea: If the thing is an mistake that claims the Microsoft Office installer.pkg cannot be opened as it is from an unknown developer, wait around ten seconds and move the downloaded file https://aarondefant.de/microsoft-office-2021-mac-standard-sofort-download-fur-eine-schnelle-und-einfache-installation/