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Even from Standard Core the update doesnt seem to work.
DISM /online /Set-Edition:ServerDatacenterCor /ProductKey:WMDGN-G9PQG-XVVXX-R3X43-63DFG /AcceptEula
1) after Restart:
slmgr /ipk H3RNG-8C32Q-Q8FRX-6TDXV-WMBMW slmgr /ato