Having the same issue :C , have both set to admin and rebooted my switch plus let it go into and out of sleep mode.I'm having the same issue. On latest Atmosphere and latest firmware. It says "Connected" for like 5 seconds and nothing comes on the switch screen except the default startup settings.
EDIT: Just randomly got it to work. I set both the ffmpeg.exe and In-HomeSiwtching.exe to run as admin under compatibility in options and it worked after letting my switch go in and out of sleep.
Also on the latest Atmos