You should note that sellers like this are being deceptive when they call it Office Professional 2021. What they are really selling are keys for Office Professional Plus 2021. They give it away when they list what it includes. Microsoft Office Teams only comes with Office Professional Plus 2021.
Note that on their site they say that Office Professional 2021 includes:
- Microsoft Office Word
- Microsoft Office Excel
- Microsoft Office PowerPoint
- Microsoft Office Outlook
- Microsoft Office Teams
- Microsoft Office OneNote
- Microsoft Office Publisher
- Microsoft Office Access
I am not complaining because I have two copies of Office Professional Plus 2019 and one of Office Professional Plus 2021.
Sometimes there is confusion of why some of these keys work and others don't. Some people say that Office Professional 2021 Plus is a volume license software. It is but not the same as regular ones. Regular volume license software are activated by either KMS or MAK keys. Office Professional 2021 Plus is activated by special volume license retail keys. These keys like KMS and MAK keys can activate more than one copy of Office. They are meant to be used by computer professionals to evaluate software. The keys are not to be given away or sold by the professional who obtains them from Microsoft. These keys are probably are what are being sold online. Microsoft doesn't give the original professional user of these keys an absolute number of time he uses it to activate Office. The problem comes when these keys are sold online. If the keys get used too many times then Microsoft's Activation Servers catch this and deactivates the keys. This probably happens when the online seller tries to sell the same key too many times. That may be why some these sellers suddenly disappear. "Reputable" sellers try to minimize this by limiting the number of keys they sell. If one of their keys does not activate they will just replace the problem key with another one.
on that.
