Windows Server 2019 Essential - The product key entered does not work

jackrm85 1 Reputation point

Hi, I created a VM and installed windows server 2019 Essentials Evaluation and after 3 months I decided to buy the original license (OEM).
Activation fails and generates an error message:
The product key entered does not work. Check it and try again or enter a different one (0xc0020036)
From cmd, it reports Error 87, Invalid Product Code KEy.
I tried these commands:
slmgr -ipk <KEY>
(0xc0020036) On a computer running a non-core edition of Microsft windows, run slui 0x02 0xC0020036 to view the error text. If I run the command it tells me "No Endpoint available in the endpoint mapping"

I tried to do these procedures but without success:

sfc / scannow
dism / online / cleanup-image / restorehealth

Windows Server 2019 Essential is not a Domain Controller, there are no Antivirus and the only firewall is the Defender that I have also tried to disable.

What can I do to activate the license?

Windows Server 2019
Windows Server 2019
A Microsoft server operating system that supports enterprise-level management, data storage, applications, and communications.
2,635 questions
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3 answers

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  1. Dave Patrick 351.5K Reputation points MVP

    Might also try phone activation
    slui 4

    --please don't forget to Accept as answer if the reply is helpful--

  2. Dave Patrick 351.5K Reputation points MVP

    no more endpoints available from the endpoint mapper

    this occurs when some process that uses dynamics points is called repeatedly and never completes. It consumes all the dynamic ports

    netstat -aon
    should show this. As a work around try rebooting.

    --please don't forget to Accept as answer if the reply is helpful--

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  3. Jenny Feng 13,801 Reputation points


    This error 0xc0020036 may be caused by the incorrect license key.

    You can choose to adjust the value of sppsv in the registry editor.
    Note: Make sure that you back up the registry you modify it.

    Now, here is the tutorial.
    Press Windows key and R key together to open Run dialog.
    Type regedit in the box and click OK to continue.
    Then navigate to the following path: Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\sppsvc
    On the right panel, choose Start key and double-click it.
    Then change its value data to 2 and check the option Hexadecimal.
    When it is finished, reboot your computer and check whether the error code 0xc0020036 is removed.

    Also, since this is a technical community and not a licensing one, if you need a definite answer you'd better contact your reseller or a trained Microsoft licensing specialist regarding your licensing questions.

    Please contact the Microsoft Activation Center.

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