I have the same problem also. Google does not speech in Redmi Note 4X.
I have installed: Google Search, Google Now and Google TTS, but still no works. Please help resolve this issue. This is very important feature for me.
graw2: Could you explain how you fix it?
Thanks for response.
I've done. "Ok Google" works properly, but still not talking back. The assistant answers only when I say: "Call sb", then response "I cannot do that, when phone is locked".