Microphone doesn’t work if i use iMessages to make memoji or take a voice note

Greetings CP40264,

Ensuring the microphones are working as expected is important. There are several microphones on the iPhone of which may or may not be used by specific applications. To isolate the issue and work towards a resolution, you'll want to begin with the steps listed below. If you continue to have issues after these steps, you'll want to complete the remaining steps outlined in the following article. These steps are specific to isolating and resolving microphone related issues.

Clear the microphones

1. "Remove any screen protectors, films, or cases from your iPhone.
2. Clear any debris from the openings of your iPhone."

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

Let us know how that goes!