Guess you're out of luck with this one. You'd need some kind of "Terminal Server agent" installed on that machine that translates the ports for a specific user into controllable traffic. Even Active Directory integration is useless because it only creates a user to IP mapping where the IP is the one used by the terminal server. Therefore, no further filtering is possible. Cisco legacy provides you with a solution, unfortunately I'm unaware that Meraki supports this.
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