How to disable copy/paste and drive redirection in Remote Desktop Services

I recently setup a RDS server and it is working great, but I'm wanting to lock down the RDS so that when someone is on there they can't accidentally or purposely bring anything from their local machine over to their work machine.

I have found several articles online talking about changing the local policy, but not sure how to go about this because I can't very well change the local policy of their home computers. I made the change on the servers thinking that might be it, but it still allows a user to copy/paste between their home desktop to their work machine via RDP. I've also set the CAP to "disable device redirection for the following client device types" and selected all of the options, then restarted the services, still no go. I'm fairly certain at my previous job (I had it setup there, but it's been awhile) all I had to do was change the local policy settings on the server but I could be remembering that wrong.

The section in the server policy that I changed was Administrative Templates, Windows Components, Remote Desktop Services, Remote Desktop Redirection. I enabled Do not allow Clipboard redirection, COM port redirection, drive redirection and LPT port redirection. Rebooted the server and same result, so I assume it has to be set on their local machine.

If these were company issued laptops it'd be easy to set it here first, but not sure how to go about policing their home machines and hoping there's a way to turn this off on the server itself. I've even moved these servers into a new OU, created a new GPO and made the adjustment mentioned above at the domain level, then verified the servers are getting the policy, but still the same results. When a user logs in remotely from a home computer, they can still copy a document from their desktop at home to their desktop at work.

Any help would be appreciated, thanks!