Google now voice

Hello guys,

I’m trying to set up the Google now “Ok Google” command but it doesn’t work.

There is this option where you can say “Ok Google” from any screen, even when it’s locked, and you have 3 tries to do that but when i try it it says “Can’t use your microphone, restart your device”

I have tried everything till now and it doesn’t work.

Is there anyone who can manage this? Is it working for you?

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