Apple watch series 4 microphone not working

Hey there, Filipe.

Welcome to the Apple Support Communities! Thanks for posting about the microphone on your Apple Watch not working as expected. We'd be glad to see how we can help.

Are you using a specific feature or app that utilizes the microphone when noticing that it isn't working like it normally would? When was the last time it did work properly, and has anything happened to your Watch since then? Does your Apple Watch have a case installed, and if so, does removing the case allow the microphone to work as expected? If you haven't already, go ahead and Restart Apple Watch to see if the microphone begins to work. You may also want to Update your Apple Watch if you have an available update.

We look forward to hearing back from you.

Be well.

We appreciate the update, Felipe.

If that is the case, you might want to consider having a physical inspection performed on your Apple Watch. You can learn more about that process at the Apple Watch Service and Repair page, and if you'd like some assistance with getting all of that set up, or if you need additional guidance, Get Support directly from Apple here.

Take care.