False Terminalname in RD Session

I configured the Wyse Management Suite in our environment because we want to upgrade our old Terminals with ThinOS 8.6.

I bought some new Terminals (Dell Wyse 3040) with ThinOS 9.1.2101 and upgraded them to 9.1.5067. I configured WMS and everything works perfectly. The only problem is that in my RDS session (Microsoft Terminal Server) the clientname is not the same as I configured in WMS.

I set the terminalname for example as TC1111 in WMS and this is also displayed on the Terminal but not in my RD session. The Clientname in my session is for all terminals with ThinOS 9.x.xxxx 5070.

Does anyone have the same problem or has a fix?