There are actually 2 different Microsoft Remote Desktop apps for Android. The current one, which is a bit slower, is active in the Play Store as Microsoft Remote Desktop. The older one, which is faster, is named Remote Desktop 8. I’m guessing only the new one has been tested, so if anyone has time, could you please sideload and test the older Remote Desktop 8 apk on Android with KRdp?
Remote Desktop 8 8.1.81.435 (don’t get the latest 8.1.81.445, as it prompts to upgrade to the New version):
wwwDOTapkmirrorDOTcom/apk/microsoft-corporation/microsoft-remote-desktop/microsoft-remote-desktop-8-1-81-435-release/