No, you're not missing anything, we've encountered this issue in the past with some customers in the past using the R1-R5 licenses.
It's always been hard to solve, but has come down to the license server willing to serve an R1 license to the worker, but never anything higher than that. There are a few things to check:
- are your running the latest version of the adsk_flex daemon that is available for your version of Maya (there have been patch releases from Autodesk for this in Maya 2010)
- are you running the version of the license server that corresponds to the version of Maya (different versions of Maya need different versions of the license server)
- ensure that the license server can resolve the hostname of the worker, both forwards (name->address) and reverse (address->name)
If all else fails, try setting the environment variable ADSKFLEX_LICENSE_FILE on the worker like this:
ADSKFLEX_LICENSE_FILE=@<your-license-server-name-or-ipaddress>
If you're on a Windows machine, ensure that you set a SYSTEM environment variable.