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RDP users cannot connect

We have a Windows Server 2012 RDP server that has been in production for several months.  Today many users are having difficulty connecting, getting an error of, "The remote session was disconnected because the Remote Desktop client access license stored on this computer has been modified."  

If I delete HKLM\Software\Microsoft\MSLicensing, then the clients can connect once or twice, but then receive the error again.

I have not found anything of note on the server other than the certificate was expired.  I generated a new self-signed cert and that warning went away.  Any other thoughts?
Windows Server 2012

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8/22/2022 - Mon
Justin Yeung

is that server a licensing server as well? has this been added to the terminal server licensing group in AD?

Yes it is the license server as well.  It was not in the Terminal Server Licensing group in AD (although it has worked fine up until this point).  I've just added it, and the issue seems to remain.
Justin Yeung

if you bring up remote desktop manager under the problem server

and right click on it and click on "review configuration"

is the server in "domain scope" and is there any exclamation mark on any option
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Walt Forbes

Yes it is listed in the RD Licensing Manager and the Discovery Scope is Domain.  There was an exclamation point next to the server, but there isn't now.  A few machines are showing that they have multiple Device CALs active.  There is also now a Windows Server 2012 - Temporary RDS Per Device CAL listed, which wasn't there before.
Justin Yeung

so do you have the licenses activated within the remote desktop licensing manager?

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