My MacBook microphone isn’t working

So I woke up this morning to join a zoom call meeting for my job as usual, however when it was my turn to speak, the microphone did not work. However, sometimes the odd noise would pick up ‘very faintly’ on their side but for the most part hearing me was impossible. Any suggestions? I’ve tried everything, troubleshoot, testing mic, restarting MacBook but nothing. I trust you have my answers.