Here’s how to do it using an iPhone. Open Settings and navigate to Bluetooth. Image: KnowTechie. Find your AirPods and tap the i. Image: KnowTechie. Tap Forget this Device and confirm. Image
Turn on Dictation from the Keyboard settings on your device. The first thing to do when Dictation isn’t working is to ensure it’s enabled in your iPhone or iPad settings. Go to Settings > General > Keyboard. Scroll to the bottom and tap the switch for Enable Dictation. Confirm you want to Enable Dictation.

Found this solution on reddit and it worked for me: 100% your jack is just not siting right. take it out of phone and push as forward as possible. then in to iPhone. also you can turn your mic on or off through the record screen button from the pull down from top menu. it looks like black and with target.

While you're on the FaceTime call, bring up Control Center. On devices with Face ID, swipe down from the top right corner. On devices with Touch ID, swipe up from the bottom of the screen. Tap Mic Mode in the upper right of Control Center. Select your microphone audio mode.
The feature will be enabled. Tucker Bowe. Open the FaceTime or Phone app and start a video or audio-only call. During the call, open the Control Center. (Swipe down from the top-right corner of the screen.) Tap Mic Mode. Select Voice Isolation. Go back to your call. The feature will be enabled.
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iphone 11 pro mic not working