Fixed: Mic Icon Missing from Keyboard (iPhone Voice to Text)

Solutions

Solution 1: Enable the "Siri & Dictation" feature in Allowed Apps

1. Go to Settings -> Screen Time.
2. Choose "Content & Privacy Restrictions" in the Restrictions section. 
3. Choose "Allowed Apps & Features".
4. Enable the "Siri & Dictation" feature.
5. Now check whether the microphone icon appears or not on the keyboard.

Solution 2: Check your phone's internet connection.

The keyboard won't show the Microphone icon if your phone's internet connection is turned off. So make sure to enable mobile data or Wifi. 

Solution 3: Check Dictation is turned on

1. Go to Settings ->. General ->Keyboard. make sure the "Enable Dictation" option is turned on.

Solution 4: Disconnect the Bluetooth device and turn off Bluetooth

• If the Bluetooth device is connected to your iPhone, everything you say comes from a Bluetooth device. Just disconnect the device and turn off the Bluetooth. 

Solution 5: Enable the "Hey Siri" option

1. Go to Settings -> Siri & Search. 
2. Enable Listen for to "Hey Siri"
3. Now go back keyboard and check the microphone icon. Test the voice-to-text typing.