Microphone not working on keypad

[AC Question]

The microphone isn't working on my key pad. I just got a new phone from warranty and the microphone isn't working. I have checked everything I can think of to see why it won't work, but still nothing. The microphone works on Google search. The microphone works on everything else but not in the messages. If I'm using utube, or sending a email, Google etc. It all work but nothing no sound, no nothing. Can you please help me?

Thank you,
Crystal..