How do I un-mute my microphone on my LG (it hasn't worked since the Lollipop Upgrade)?

[AC Question]

Lollipop Upgrade. Un-mute microphone on Moto G

When I make a phone call I can hear the person I'm calling talking but they can't hear me because the microphone is muted. This happened after I upgraded the OS to Lollipop 5.02. Do I have to do a factory reset? Right now, the phone is essentially useless.