View your KMS-Server via cmd
nslookup -type=srv _vlmcs._tcp
Make sure you can reach the kms server using powershell
Test-NetConnection KMS-servernameorip -Port 1688
Install KMS-Key
slmgr /ipk xxxxx-xxxxx-xxxxx-xxxxx-xxxxx
Active online
slmgr /ato
If it fails you can try to restart the software protection service
net stop sppsvc
net start sppsvc
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