Why am I getting the message: "This NComputing device is not authorized to use the version of vSpace Pro to which you are connecting"?

We have an article that explains this in detail. We encourage you to read it carefully:
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This NComputing device is not authorized to use the version of vSpace Pro to which you are connecting...
Message Context If you see this message when using your NComputing unit, your NComputing device(s) (L250, L300 or M300) was manufactured prior to January 1st, 2015. You can quickly check the date of manufacturing by looking on the sticker under the ...
Device shows a black screen when connecting to vSpace Pro and returns to Server List menu.
This article assumes that you are using vSpace Pro Enterprise, or 11.3.2 LTS and are using L250, L300 or M300. Any other version of vSpace, as of the writing of this article is not supported. If your terminal displays this behavior, the device was ...
vSpace Pro Installation - Tips, References and Process Detail
Published The following article is a detailed process and tips for installing our vSpace Pro platform (vSpace Pro LTS, vSpace Pro Enterprise Edition). As an additional supplement, this article will deal with all other aspects of Pre-Deployment and ...
If you decide not to subscribe to AMP, can I still use vSpace Pro Enterprise Edition?
Yes, AMP for vSpace Pro is only applicable for customers who have RX300, L250, L300, L350, M300 and MX100 devices and want to access vSpace Pro Enterprise Edition. If the customer has these devices but is not vSpace Pro AMP compliant, then there is ...
What are key benefits of using vSpace Pro 11 LTS
vSpace Pro 11 LTS supports 10 popular Windows™ operating systems, including Windows Server 2016 and Windows 10. If you use Windows, you’ll be right at home. Your users will all have the same familiar Windows desktop experience. Access the Windows ...