Your system does not activate the Windows license via KMS.
KMS will sometimes not work. You need some manual activation.
Try to execute the following.
cscript.exe C:\Windows\system32\slmgr.vbs /ato
If this does not work, please check your DNS for the following entry:
This can be done with the cli of nslookup.
About the Author
Wim Peeters is electronics engineer with an additional master in IT and over 30 years of experience, including time spent in support, development, consulting, training and database administration. Wim has worked with SQL Server since version 6.5. He has developed in C/C++, Java and C# on Windows and Linux. He writes knowledge base articles to solve IT problems and publishes them on the Lubby Knowledge Platform.