Something that might help you out is using an app like FlexiHub which will allow you to share 3Dmouse over RDP. It kinda acts as a bridge that passes the USB signals directly to your remote computer, essentially making it feel as if the device is connected locally.
Give it a shot and see if it helps with your 3dconnexion mouse over RDP. It's worked for me with some other devices when Remote Desktop just wouldn't play nice. Here is the detailed guide 3D mouse in RDP discussed on Reddit.
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