MacBook M1 FaceTime microphone not working

My MacBook's FaceTime is not working. MacBook is 2020 m1 chip. so there is some problem with my FaceTime mic. When I FaceTime somebody, I can hear the other person, but the other person cannot hear me. And there is no problem with my speakers, because when I use Snapchat on my laptop, I can hear the other person, and the other person can clearly hear me.