After configuring "RDS Licensing Server 2012 R2" the popup "Remote Desktop licensing is not configured" pops up, but you configured all needed settings.
If you open the "RD Licensing Diagnoser" its saying you have to configure the "license server" name and the "RD licensing mode".
If you configure the same settings via policy the popup will disappear and as well as warnings in "RD Licensing Diagnoser".
To configure these settings via policy open "gpedit.msc" and browse to the following path:
Local Computer Policy / Computer Configuration / Administrative Templates / Windows Components / Remote Desktop Services / Remote Desktop Session Host / Licensing
and setup the following settings depending on your environment.
"Use the specified RD license servers" = yourservername
"Set the Remote Desktop licensing mode" = Per User