Why do Bluetooth headphone microphones not work with Google voice to text and most apps?

[Android Central Question]

I have a note 8 running Android 9.

 

[Gumby1978]

Tap on G in search bar, bottom right More, settings, voice, voice search on Bluetooth devices

 

[B. Diddy]

Welcome to Android Central! Also, in the Google app's settings under Voice, see if it helps to turn on the Bluetooth Audio Recording toggle.