had issues with Remmima and Win 10 last week - worked around it by using xfreerdp directly at the command line. this is what I use from a linux command line to set the resolution and sound (audio-mode:1 is same as Remmima local sound, or supposed to be)
this keeps all audio local on the system, which is what I need.
Remmima was working fine until I messed with the settings to see if I could have both local and remote audio with RDP (you can’t) and then I could not get the local audio back no matter what I did - tried deleting profile, reinstalling, etc. Nothing worked until invoking xfreerdp directly. Been flawless since then.