If you have purchased a standalone product key (such as a cheap OEM key from a reseller ), the process is: Overview of Office LTSC 2021 - Microsoft Learn

Clave De — Activacion De Office Ltsc Professional Plus 2021 Repack |work|

If you have purchased a standalone product key (such as a cheap OEM key from a reseller ), the process is: Overview of Office LTSC 2021 - Microsoft Learn