Attempting to XRDP into RHEL client via a Thin Client

Good morning,
I have installed XRDP onto my RHEL 7 workstations and when I attempt to connect using a computer running Windows 7, I can get right in. So no problem there. However, I have users that are don't have physical machines at their desk and are using a WYSE 7010 (ThinOS) Thin Client for work. When they try to XRDP into their RHEL 7 workstation, they are able to input their user name and password but it goes to a black screen then back to their initial login screen. I'm getting "rdp: virtual channel rdpsnd error" as my error. What am I doing wrong?