Problem managing Remote Desktop Licensing with PowerShell on 2012 R2

Hello,

I am trying to follow these instructions for managing Remote Desktop Licensing with PowerShell on a 2012 R2 server, but when I try to switch to the RDS drive (cd RDS:\) on the server with RD Licensing installed, I get the following error:

Cannot find drive. A drive with the name 'RDS' does not exist.

What am I doing wrong? It seems like I must have forgotten something simple...

Thanks,
Dan