I have a Moto X 2nd Generation phone and recently purchased the Goggle Mini.  I installed the Google Home app on my phone and was able to train the mini to recognize my voice.  So far so good.  Then I installed the Google Mini app on my wife's phone and trained it to recognize her voice.  Perfect!  Except after that when I asked the mini to setup an appointment on  my calendar it told me "I cannot recognize you're voice so I cannot do that".  I have tried for two days to get it to recognize my voice but it just keeps asking me to say "hey Google" and nothing happens. So far I restarted my phone, restarted the mini, uninstalled the app on my phone, reinstalled the app and nothing works.