Why does my phone misbehave when the headphones are on? I do NOT want it to work while locked!!E

[AC Question]

Every time I try to watch YouTube my phone constantly goes to Google and says ".If you said something I didn't hear it". I THOUGHT and still THINK I have my phone set NOT to work while locked, With or w/o headphones.

 

[Sam_Gs7]

I read some users reports that - Google assistant app it works
with their locked phones: If so try open YouTube using
Google assistant. Say "oK Google open YouTube"