Are you talking about the Google Voice telephony service (i.e., the one where you get your own number and can forward multiple lines to that number), or voice-to-text dictation?
Are you talking about the Google Voice telephony service (i.e., the one where you get your own number and can forward multiple lines to that number), or voice-to-text dictation?
Are you using the Gboard keyboard app, or another one? Have you checked the keyboard app's settings to see if there's a toggle to turn the microphone icon on?