Doubt about Remote Desktop License server

Hi,
few months ago I posted a question here:

https://www.experts-exchange.com/questions/29019958/Activate-Windows-Server-2016-CAL-on-Windows-Server-2012.html

anyway, I still have some doubts..

I installed "Remote Desktop Connection Broker", "Remote Desktop Licensing" and "Remote Desktop Session Host" roles on a Windows Server 2016 machine.
After this, I installed 10 CAL for Windows Server 2016 "per user", and it seems it worked fine.

In Remote Desktop Licensing Manager, I see:

rd.png
My question is: I need to use such CAL on a number of servers in same active directory domain, some are Windows Server 2008, some are Windows Server 2012..

Should I "downgrade" my 10 CAL (which are for Windows Server 2016)?
If so, should I downgrade some license to 2008, and some to 2012, or is it not possible?

In case it is not possible, should I

- downgrade my present license to 2012
- buy NEW licenses (honestly I think I will only able to find CAL for Windows Server 2016), and downgrade them to 2008?


Thank you
Armitage318Asked:
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ferraristaCommented:
If I remember correctly your License server cannot be on a higher OS version that your session hosts.
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Pete LongTechnical ConsultantCommented:
No your 2016 Licence servers can process license requests from servers going back to 2003!

"Remember that a 2016 license server can process CALs from all previous versions of Windows Server, down to Windows Server 2003." Source https://docs.microsoft.com/en-us/windows-server/remote/remote-desktop-services/rds-supported-config
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DrDave242Commented:
You don't need to downgrade those CALs. Newer CALs can be used to connect to older servers, as mentioned in this article:

You can't use older CALs to access newer Windows Server versions, but you can use newer CALs to access older Windows Server versions.

So you should have no trouble connecting to older session hosts using the 2016 CALs you've got installed.
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Armitage318Author Commented:
Hi,
ok, thank you very much.
At this point, I think I missed some steps..
When I log in Windows Server 2016, I see this popup:

"Remote Desktop licensing mode is not configured.
Remote Desktop Services will stop working in 8 days. On the RD Connection Broker server, use Server Manager ..."

It is not clear what should I do. Can anyone help me ?
Thank you
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DrDave242Commented:
Sorry, I apparently forgot about this question. Were you able to get the licensing mode configured in the Remote Desktop section of Server Manager?
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Armitage318Author Commented:
Hi DrDave, not yet.
Thank you
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DrDave242Commented:
This short article shows how the licensing mode is configured in Windows Server 2012 and later versions (so far). If you follow those steps, does it show that it's already configured as "Per User"?  If not, please set it that way and see if your issue goes away.

If the licensing mode is already set to "Per User," launch the RD Licensing Diagnoser from the Tools menu of Server Manager and let me know what it says.
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