P1Gen3 won't go to sleep

[Muse]

I have "Close the lid' action set to put the Windows 10 machine to sleep, but it stays awake. Pressing the power button is supposed to do the same thing and it doesn't go to sleep. Even Start menu, Power, Sleep only blanks the screen, but a touch of any key or the trackpad instantly turns the screen on and it's clear Sleep never happened. I have tried everything I can think of including different Power schemes, going back to defaults, can't find anything in BIOS or Lenovo Vantage. What could be wrong?