RemoteAPP via rdesktop to Windows terminal server works in Ubuntu 18.04 but not raspbian?

I'm trying to connect a RaspberryPi to a Windows terminal server RemoteAPP. In Ubuntu 18.04, I use the following command:

rdesktop %hostname% -f -d %domain% -u %domainuser% -p %domainpassword% -s "c:\Epicor\Epicor10.2Client\Client\Epicor.exe /config=ERP102Live_sso.sysconfig /shell /MES"

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However, when I use Raspbian or Ubuntu MATE, I get access denied errors on the windows side upon connecting. There was one time that it worked correctly, but like an idiot I didn't take an image. So my question is, what could be different with rdesktop between Ubuntu 18.04 and Raspian/MATE?