"The licensing mode for the Remote Desktop Session Host server is not configured" and Cannot find the Remote Desktop Session Host Configuration tool in Windows Server 2012R2 ?

Dude, the Remote Desktop Session Host Configuration tool no longer exists in Windows Server 2012 :-p

But you still have to configure the licensing mode. You can dot it with GPO through Active Directory.

You can also do it via a local policy.

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Run > gpedit.msc

Computer Configuration>Administrative Templates>Windows Components>Remote Desktop Services>Remote Desktop Session Host