Hi,
According to your description, there seems no enough info to troubleshooting this issue, KMS activation issues can be due to a misconfiguration on one or more of the following items:
-
Office client
-
Network/DNS
-
KMS host
To quickly identify your KMS trouble spots, use either the Office Client KMS activation diagnostic or Office KMS Host Activation diagnostic tool to analyze your environment for known issues. These diagnostic tools automate almost all of the troubleshooting
steps available for KMS issues and provide a detailed report with recommendations on how to fix the detected issues.
You should always analyze the client first by using the Office Client KMS activation diagnostic tool, even if you feel you have a KMS Host configuration problem. It’ll determine if your changes need to occur on the client, your network, or your KMS host.
If the Office Client KMS activation diagnostic tool indicates you have KMS host issues, you should then run the Office KMS Host Activation diagnostic tool.
For more detail information, please refer to the following links:
https://technet.microsoft.com/en-us/library/ee624355.aspx#KMSActivationIssues
https://support.microsoft.com/en-us/kb/2870357
Regards,
George Zhao
TechNet Community Support
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