How to resolve the 'Unable to install Client License Key Pack' error

Question

I would like to ask for guidance on how to change the license program.

The steps shown in the attached file, “0318_MS Response,” were provided by Microsoft when we contacted them on March 18.

However, I believe those steps apply only when the license is already installed.

As shown in the “Current Status” sheet of the attached Excel file, the license we want to remove is not currently installed.

Therefore, I would appreciate your guidance on how to reset the license program under this condition.

Contract Information

Contract Type: MPSA (Select Plus License)

Agreement Number: 84154350

Current Issue

Error message:

“The client license key pack could not be installed.”

We apologize for the inconvenience and would appreciate your support on this matter.

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エラー画面

Answer 1

Hi Isobe, Yasuhiro,

I’m following up to check whether the issue has been resolved. Feel free to reply if you need further information. If the information provided was helpful, please click "Accept Answer" to help others in the community. Thank you!

Answer 2

Hi Isobe, Yasuhiro,

You are correct in your understanding: the steps provided earlier mainly apply when an incorrect CAL pack is already installed. In your current scenario, since no license pack exists on the server, there is nothing to uninstall, and the issue is more likely related to how the license program is being interpreted during installation.

In this case, I recommend focusing on the installation method rather than attempting a reset. Please ensure that when running the RD Licensing Manager wizard, you explicitly select the correct license program, “Select Plus (MPSA)”, and carefully input the Agreement Number (84154350) exactly as provided. Even a minor mismatch in program type or agreement details can trigger this error.

Additionally, since your RDS license server is operating in an offline environment, I strongly suggest using the Web Browser activation method. This involves generating the request from the license server, completing the process via https://activate.microsoft.com/ on a separate internet-connected machine, and then applying the response back to the license server. This method avoids validation issues that often occur in offline scenarios.

It’s also important to verify that the license type you are installing (User CAL vs Device CAL) matches what is provisioned under your MPSA agreement, as a mismatch here can also result in installation failure.

If the issue persists after confirming all inputs, I would recommend double-checking with your reseller that the agreement is fully activated and that RDS CALs are properly assigned under the MPSA contract, as backend provisioning delays can sometimes cause this behavior.

I hope this helps clarify the situation and gets you unblocked. If you find this guidance useful, please feel free to mark it as “Accept Answer” so others facing the same issue can benefit as well.

Jason.