Were you able to verify if there is a waiting period before the user is
notified and the app removed? I've only been playing with this for a
week so far.
I'll just throw my 2 cents in. I was having this same issue and
combining my "Login Window" settings and "Security & Privacy" settings
into one profile worked for me too.
Has anyone found a solution for this? I am needing to set a "Property
of..." message on the lock screen of our Macbook Air laptops when needed
but haven't been able to find a way to do that yet.