No. You used a corporate key. A "Lifetime" key. In the Terms of Service, paragraph 4, section C, it states that the "Lifetime" license entitles the holder to software updates and direct administrative support for the duration of the natural lifespan of the registered entity.
: You can use Word, Excel, and PowerPoint for free in your web browser by signing in at Office.com. This provides a lifetime "license" to the web versions and retains all your data in OneDrive.
No legitimate source will ever give you “Microsoft Office 2021 Professional Plus lifetime license key free” as a downloadable file. If you see that phrase, run the other way.
Microsoft Office 2021 Professional Plus: Understanding Licenses and Avoiding Risks