My mic isn’t working on FaceTime . I can hear them but they can’t hear me. How do I fix that.

Re: "How do I fix that.?"

Most likely answer:

You may have mute turned on, and need to turn mute off.

We don't know whether you are using a Mac, iPhone or other device for FaceTime.

Check ScreenTime > Content > Privacy settings to check microphone is not blocked.

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Else:

Apple support have articles online that may help:

Eg:

Mac

If FaceTime isn't working on your Mac – Apple Support

Control access to the microphone on Mac – Apple Support

Choose a camera or microphone for FaceTime calls on Mac - Apple Support

iPhone

If the microphones on your iPhone aren't working - Apple Support

Review or change access to the microphone:

Control access to hardware features on iPhone – Apple Support

iPad

If the microphones on your iPad aren't working - Apple Support

Support if needed:

The FaceTime Support Team's Website:

FaceTime - Official Apple Support

All the best :-)