There is a Microsoft issue which prevents using Unicode input in powershell in RDP sessions: if "Send input as Unicode" option is active, Powershell ignores all keyboard input. Someone already try to report this bug, but you could not reproduce it ( https://forum.devolutions.net/topics/41425/keyboard-not-working-on-powershell-inside-rdp-server ). It can be reproduced by using "Send input as Unicode" option and if on remote server "PSReadLine" module is 2.0 or lower version:
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Its not bug of Remote Desktop Manager, but Microsoft RDP. So I know that you can't fix it. But maybe it is able to add for MAC version of RDM hotkey or menubar option, that can toggle "Send input as Unicode" option on the go, without opening connection preferences and reconnecting session (I guess its possible because its able in Microsoft RDP client for Mac).
Sometimes its need to jump between dozens of RDP servers which have a many different input languages, and without "Send input as Unicode" option work becomes like hell. But bug that I describe above still exists, and sometimes becomes a really annoying when you need to open Powershell and quickly type some commands. Y ou have to open a notepad, write commands there, and then copy it to PowerShell.