If your Windows is showing not activated, please use following keys to activate your OS.
Windows Server 2019 Datacenter : H3RNG-8C32Q-Q8FRX-6TDXV-WMBMW
Windows Server 2016 Datacenter : TMJ3Y-NTRTM-FJYXT-T22BY-CWG3J
Windows Server 2012 R2 Standard : DBGBW-NPF86-BJVTX-K3WKJ-MTB6V
Windows Server 2012 R2 Datacenter : Y4TGP-NPTV9-HTC2H-7MGQ3-DV4TW
Please let us know if you need further assistance.