"Ok Google" voice unlock stopped working on Google Nexus - "Actually I can't do that while the device is locked"

On the Google Nexus 6P phone, I had a variety of behaviors that were occurring. Before my Android OS upgrade, Google Now worked fine when the phone was sleeping and locked. After the upgrade, it stopped working. Behaviors after upgrade: Then after I retrained the Google Now app... I put the phone in sleep mode by pressing the power button once. You can also put the phone in sleep mode by waiting for the elapsed time period. When saying "Ok Google", nothing happens. If I take the phone out of sleep mode, and get the phone to the 4 digit pin code, there's a little microphone icon in the lower left. If you press and hold and swipe up and to the right, you can begin talking. Google will say, "actually i can't do that while the device is locked". There are various forums saying Google Now no longer works. Is this true with Android 6.0.1?