HI CaseyMichael-5865,
Thank you for discovering this issue, could you please post this issue in below forum so that PG can find and improve it in future.
Feedback for Microsoft Remote Desktop Clients
https://remotedesktop.uservoice.com/forums/266795-remote-desktop-services
If administrators' computer and user's computer in the same AD domain, we can try to use MSRA software or mstsc /shadow.
mstsc /shadow dont't work
https://social.technet.microsoft.com/Forums/windows/en-US/c50a0a3c-c548-49de-b807-bc09d1f73319/mstsc-shadow-dont39t-work?forum=win10itprogeneral
How to: Use MSTSC as a Remote Viewer/Controller
https://community.spiceworks.com/how_to/136210-use-mstsc-as-a-remote-viewer-controller
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