How odd...
The only setting I had that differed from yours was:
Lock when device wakes up - ON
Mine was set to "Off", which you would think would not effect the behavior I was experiencing, and I've never set that to "On" before and everything worked. Just changed it to "On" and hitting the power button is now triggering S2U2.
Thanks!
Anyone know what that setting actually does? (aside from fixing my problem
)