Microsoft permanently ended support for Office 2019 on . The software no longer receives: Critical security patches. Bug fixes or feature updates.
Searching for "Microsoft Office 2019 product key GitHub" typically leads to several distinct types of resources: lists of Generic Volume License Keys (GVLKs) PowerShell scripts for activation, and containing shared product keys. Types of Office 2019 Resources on GitHub Generic Volume License Keys (GVLKs):
How to find product key for Microsoft Office already installed