Dear sir or madam,
From the manual, I find some info.
Nvidia ShadowPlay – Current spacedesk version has a known issue with Nvidia ShadowPlay. While Nvidia ShadowPlay (screen record) is active, spacedesk will give an error code 1-2-0 on the viewer side. Just disable it in order to use spacedesk.
Night Light – Windows Night Light settings is currently not supported on spacedesk displays.
So, I update the latest Nvidia driver and close the experimental features and in-game overlay, but spacedesk still cannot work and show the Error code 1-2-0 error info 0-3-4 on the screen. I have tried to run command prompt as administrator and typed the following commands. But these below are not running.
sc query FLxHCIv
sc query lci_proxykmd
sc query lci_proxywddm