RD Licensing Diagnoser has this error message:
The Remote Desktop Session Host server is in Per User licensing mode and No Redirector Mode, but license server --- does not have any installed licenses with the following attributes:
Product version: Windows Server 2016
Licensing mode: Per User
RD Licensing Manager shows:
Windows Server 2016 - Installed RDS Per User CAL | Open (license program) | 10 (Total Licenses) | 0 (Available) | 0 (Issued) | Never (expiry date) | 3 (Keypack ID)
Why are 0 licenses available? The licensing agreement shows WINRMTDSKTPSRVCSCAL 2019 SINGLE NL USRCAL 6VC-03748 10
Is it because these are designated 2019? In my experience, I could always install later version licenses on a previous version of Windows.