When I press the nc/ambient button the google assistant does not listen.  If I have the app open on my phone I can see that it starts to listen but only for about half a second and then the mike stops listening.  If I use google assistant just on the phone without the headphones it works fine.  Only bought yesterday so tempted to take back.  I have removed both apps from iPhone, restarted phone, reset headphones to factory settings, but still not working correctly.  Any ideas before I take them back?