Welcome to Android Forums! Sorry for the slow response.
Here are a couple of things you can try to see if the problem is the microphone itself, or something else. Try giving the phone a voice command, doing a voice search, or make a voice recording. If these work fine, then the problem most likely isn't the microphone. You can also try turning the volume down low. Sometimes microphones will have their sensitivity turned way down when the volume is way up to avoid feedback. If none of this works, then the microphone itself is probably bad.
I hope this helps! If not, there are two avenues: You can re-submit your question with additional info the same way you submitted this one, or you can join the forums for a better back and forth exchange of info.
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