'Night' mode and 'Things Quiet Down'

I am trying to get ‘Night’ mode to come on automatically after I disarm by manually pressing ‘Home’ mode/Routine.

I set the ST app [Change the mode to] ‘Night’ and within the additional settings section, I opted for ‘Things Quiet Down’. Provided there is no motion in the garage motion sensor for 5 mins between 0001 to 2359 hrs, I would like St to go to ‘Night’ mode.

Unfortunately, it doesn’t work. I tried setting the duration from 5 - 30 mins but no luck. Have also check the other inputs like [Don’t automatically do this if I am …these modes].

Can anyone help?