How to reinstall Mac Mini M1 Built-In Microphone?

Hi,

I recently installed Camtasia on my Mac Mini M1, and it asked a question about the microphone, long story short, I've accidentally deleted the built-in microphone and now it's not available to select as an input.

Does anyone know how to reinstall the mic, any help would be much appreciated.

I've attached a screenshot so you can see that it's been removed rather than just inactive.

Thanks in advance, Luke