If you have already purchased or installed Office 2019, you can locate your key through several methods:
A product key is a unique 25-character alphanumeric code used to unlock the full suite of Microsoft's 2019 productivity applications. Unlike the subscription-based Microsoft 365, this version is a one-time purchase license for a single PC. Core Applications Included microsoft-office-2019-professional-plus-product-key
Access and Publisher are not available for macOS; this edition is primarily designed for Windows 10 and Windows 11. How to Find Your Product Key If you have already purchased or installed Office