My microphone is not working in iMessage and other apps

Hi there, Kastertroy7.

The steps below may help with any microphone issues you're encountering with your iPhone XS:

"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 people can't hear you on phone or FaceTime calls

1. Open the Voice Memos app. 
2. Tap the Record button , speak at the bottom of your phone, then stop the recording. 
3. When you play back the memo, you should hear your voice clearly.

If people can't hear you when you're using speakerphone 

1. Open the Camera app.
2. Record a video while speaking at the top of your iPhone.
3. Tap the camera chooser  to switch to the other camera. Then record another video while speaking at the top of your iPhone.
4. When you play back the videos, you should hear your voice clearly."

Those steps are from the following article: If the microphones on your iPhone aren't working - Apple Support

You'll also want to make sure your iPhone is on the latest iOS version, as being fully up to date can sometimes help resolve issues. If needed, this article shows you how to backup and update: Update your iPhone or iPad - Apple Support

Let us know if those help or if you've already tried those steps.

Take care!