Official message
Microsoft original
The activation server determined that the specified product key could not be used.What this means
The product key does not match the installed product version, or it has been used more times than allowed.
Common causes
- The product key does not match the installed version.
- The product key has no activations left.
Do this first
Check that the product version for this key matches the version installed on this system.
What to do next
- 1Use the product key that matches this version.
- 2Ask the channel that provided the key to check its status.
Continue diagnosis from this code
Take what you know into the Windows activation diagnosis. It will ask a few more questions to narrow this down.
Sources
Related articles
About this data
The meaning and the original message come from the documents listed above. The same error code can have more than one cause. This site gives an order of checks. It does not decide your exact situation from the code alone.