Our Windows Core Domain controller installations do reside in a place without internet connectivity so activating

Windows activation on Core without Internet connection

Install the Key, if you did not during installation:

cscript windows\systen32\slmgr.vbs –ipk ABCDE-FGHIJ-KLMNO-PQRST-UVWXY

If the Server would have internet access, the activation would work with:

cscript windows\systen32\slmgr.vbs –ato

For the net connected Server wi do have to phone Microsoft

To get the installation ID:

cscript windows\systen32\slmgr.vbs –dti

To get the installation into a textfile

cscript windows\systen32\slmgr.vbs –dti >>C:\act.txt

Call Microsoft, you will then get a confirmation ID

Enter the received confirmation ID:

cscript windows\systen32\slmgr.vbs –atp 1234567890123456789012345678901234567890