I just bought these QC20s off of Amazon and they just arrived. I turn on NC expecting NC to turn on yet I could hear everything around me still. I did a reset and same problem occurred.
The NC on Q20 (if anything like Life 2) is not great at blocking off human noise. It’s mostly for AC/Fan noise in the background. I haven’t tested my Life 2 on a bus or something so no idea about it but at home it tones down some human noise if I’m in a different room from everyone else (primary use case for me)