If you are using Terminal Names within SambaPOS - ie Terminal specific menus, etc, you need to make sure that you move the SambaSettings.txt file to the user path for SambaPOS for each RDP user. This is typically C:\Users{user profile}\AppData\Roaming\SambaPOS\SambaPOS4 If you don not do this, all RDP users will have the same Terminal Name.
You can file the App Path & User Path in Manage->Settings->Local Settings.
iPads (Apple devices) seem to hate Windows computer (NETBIOS) names.
Set a static IP address on the RDP server (so a restart doesn’t set a new IP address), and connect using IP address instead of server name.